I find it both easier and less stressful to just buy new stuff as it comes out.  Unless I'm really bored or really interested in something I don't even bother checking secondary marketplaces, it just takes too much dedication and time for me to bother. 

I average about an order a month from CDJapan and I went through and found 13 orders I made which consisted of 38 total albums in 2015.  I buy mostly based on artist.  Everything from Hisaishi.  Almost everything from SQEX, Sakimoto, Sugiyama, Kanno, Hamauzu, etc.  I'm very keen on box sets just because of how convenient they are in amassing a great quantity of source material in one purchase instead of having to hunt down copies of everything (again, time, dedication).  I bought the Gust box set just because it was easy despite never hearing much of the music from any of them (except the one Kikuta had a part in). 

In real slow months or quarters where there just isn't anything interesting coming out, I'll randomly purchase things based on popularity, recommendation, exploration or just complete random.  I bought the Gargantia on the Verdurous Planet soundtrack because it was a slow period and I just liked the cover and it's been one of my favorite albums of the last 5 years.  I bought the Taira no Kiyomori "box" (5cds) because I saw someone recommend it and listened to some samples on YouTube and I now *LOVE* it.  I bought the Attack on Titan movie score just because that series seemed to be popular at the time and I'm not really a big fan of it at all.  I bought the Death Note movie OST around the same time because I have a soft spot for Takayuki Hattori... the list goes on.

I prefer it this way because I'm less likely to have to go back in 5, 10 years and be like "dang, really missed an opportunity to get that when it was current so now i have to look on secondary markets".  Seems like a pretty good methodology if you aren't too worried about fiscal responsibility and generally know what/who you like.

A vast majority of items in my collection are in the orchestrated or arranged style, or just classic nostalgia SNES RPG era stuff.  Mostly the "cinematic" type stuff.  I don't really like much of the rock, fusion arrange stuff and I pretty much detest some of the worldly instrumentation styles like Celtic or some of the shit on the SQ albums (Beer SQ was the album that made me stop buying that garbage series) or the DQ Brass series stuff.  Piano and orchestra all the way.

beatmania, pop'n music, guitar freaks & drummania, and dance dance revolution are the main series of Konami's Bemani branch... or basically the only part still releasing games, albeit ones we don't get in the west unless you have a good arcade nearby.

I would honestly say there aren't enough artists or franchises out there that I would seriously drop $30 or so on their album on day one. I'm lucky nowadays if I find 10 new releases a year that seriously interest me (not counting retro stuff). It's a combination of quality and lack of personal attachment. But I still regard the whole 90's as a decade of reverence for VGM and it sparked many upon many albums that, to me, are legendary. I like owning a piece of history, I like owning albums that "matter", if that makes sense. There was just so much going on. The Japanese composers and sound teams were at their peak, melody was at the forefront, arranged albums bloomed like cherry blossons in spring and the industry was booming with great franchises. I remember discovering STC for the very first time in 1998 and learning about each franchise or game that existed, outside of my own American NES/SNES exposure. It was overwhelming (particularly given my lack of resources to acquire new music) and at the same time, provided a true rush of discovery that I have yet to experience in any other hobby, especially once I came to grips that "OMG, videogame music...on a CD...mind. blown."

As a personal aside, I've warmed up to the "classic" orchestral arranges, but not enough to pay the prices that some of them command (the OGC's most notably). They just don't get enough listening time to occupy the resources they command.

I must also preface the above by saying I feel the same way about metal music nowadays. I am absolutely brutal with judging new metal...I'd say for every fantastic new band I find, there are about 20 (30? 40?) totally forgettable ones I sift through on Youtube. What ends up getting my hard earned cash has to earn every penny of it.

At the beginning of the year I started trying to organize my collection.  I managed to get through one pass and get everything reboxed but did not have time to properly list what I have before I ran into other issues with life that took priority. I do know I need to consolidate and sell stuff at some point because I found I had some duplicates.

Storage has always been a bitch. I'm using 12 large apple boxes because I haven't been able to find anything remotely practical to put this all in. Seriously, if you can make friends with someone at a supermarket try and get some if you're only concerned with storage and not display. If they can get you clean ones after they air out for a day or two they're awesome. The ones I have hold about 300 standard cases spine up and I stack a few loose caseless discs or dvd cases on top. They're more sturdy than typical cardboard boxes and I can stack them 3 high without worry the box is going to give and crush under the weight.

Considering DiscSox at some point to reduce size but they are pricey. On the other hand they're the only sleeve I've seen designed to store the entire CD sans jewel case.

I'm one of the suckers that still buys Japanese CDs. Can't seem to shake the habit. I track everything in a spreadsheet, but not everything is catalogued yet, so I'd estimate around 1,400 albums, 95% of which are VGM related. I used to be really vigorous about tracking down every single CD in a series no matter how rare, but now I'm pretty lazy and just buy the easy to get new stuff.