There's a guy right next to you in Princeton - bld99 (I think?) he's the one that runs a carkitcompany that sells nice toys for GT-R - he may be able to assist too. PM him. I'm about 20 mins south of princeton in Langhorne - so I could give you a taste of a stock 2010 GT-R.
Purely from a biased standpoint - I owned a BMW and swore to never again. My ownership entailed well over 40 trips to the shop over a course of 3 years, and a breach of warranty lawsuit that ended in my favor, with BMW paying out $11K in damages - which was barely enough for me to trade the car in and PAY THE DEALER $11K to take it off my hands.
My best friend owned an M6 as well as X5 - similar story, lots of trips to the shop, electronics issues out the ass, horrible ownership experience. I can keep going.
GT-R - will be a noticeable car. Not that many of them around, so, if you're not the type that likes extra attention - stay away. I constantly have either someone chasing, taking pictures, or complimenting the car, to the point where it gets to be intimidating.
Keeping a GT-R at speed limit is TOUGH. Very tough. The biggest issue is that car wants to go fast. You're traveling 100Mph and it feels like 60. Very scary prospect if you have a lead foot.
Maintenance ain't cheap on a GT-R. Brakes alone will cost a pretty penny. However, just as an excercise in hillarity. Go take a look at 2009 BMW M3 price and 2009 GT-R price.
Back in 2009, @ MSRP:
GT-R - 70K
BMW M3 coupe - about 72K
Let's assume you bought either one at MSRP. Fast forward to today - GT-R is around 60 - 65K, M3 is 45 - 55K. Now, fast forward 2+ years. Depreciation on M3 will surely be substantially higher than GT-R. Also, as others mentioned - AWD vs RWD. Unless you got a beater for winter, I'd say you're not getting far in your BMW when it snows. Now, I'd sooner rent a car than drive a GT-R in the snow (I like my Godzilla low-sodium, please), but if you didn't care you could drive GT-R, whereas BMW will be sitting in the driveway. Trust me - you DO NOT WANT TO BE IN BMW when it snows, unless you got snow tires and balls of steel/patience of a saint to drive it in the snow.
Last but not the least - what's more important to YOU? Is GT-R a comfortable daily driver? not really. Its stiff suspension is not for everyone. My pampered MB-driving friend said that he'd rather cruise in comfort and style than in an exotic but not very refined rocket. I think he's biased and has grown a vagina at his mid-life juncture.
My vote is biased - I hate BMW with passion. However, even that aside - there's no contest, really.
Also, this: