My bill is about 100 dollars, or actually maybe cheaper if you consider exchange rate.
I have Type M plan which is 6600 yen, and has an allowance of 4000 yen (roughly 142 minutes a month)
Insert family plan discount and yearly discount (I am on my 4th year with DoCoMo now) I get 41% off the basic fee, so the total is 4084 yen.
I also have Pake-hodai, which is unlimited internet/mail/downloads. That is 3,900 yen.
So then, with the initial imode charge of 200 yen, my phone bill should be 8184 yen per month.
However, I tend to slightly go over by occasionally calling home on my cell phone or by using video phone, or by using the built in digital wallet (10,000 yen limit usuable through the built in IC card, basically I can buy stuff at Tower Records, etc, by just touch my phone to the register sensor) which gets charged back to me in my bill.
I also pay for my wife's usage, so that's an additional 4000 yen.
The one nice thing in Japan is there was no lock you down plans. Unfortunately, Softbank has come in and switched to a western style contract system, which other carriers are following suit, which means new owners have to pay 10,000 to 20,000 yen for cancellation fee.
On the other hand, the phones are great. I have a 3.2 megapixel camera with anti-shake built in with the ability to video call, email, surf the web, watch digital tv (one seg) use a digital wallet (saifu keitai), get on the train with the built in ic-card, listen to music, open pdf/xcl/doc files, gps, and 3g roaming built in. From winter DoCoMo's new line will all include 3g/gsm roaming with HSDA as well.
I do miss unlimited minutes, but then again, no one talks on the phone here, they just email!