Nice Viper. I drive a 335i which I like. What I don't like is that we've had the turbo wastegates replaced (under warranty), the washer fluid reservoir neck replaced (not under warranty), and the engine sprung a leak near the transmission leaving a quart of oil on the driveway overnight (under warranty), and it also required a $400 alignment (not under warranty). The passenger side power lock stopped working, which was fixed by replacing a fuse. This is all within 1 year of ownership.
I've not driven a 750, just sat in them at the dealership. The upgraded leather over the the 3 series is quite nice. Much more supple feel. The ventilated seats are quite nice. What I don't like about them is the width of the seat bolsters. I'm 127lbs and don't quite fit in them properly no matter how the bolsters and lumbar are adjusted. There's quite a few features in the 7 series that I think you would rarely utilize. How about the one where you can move the passenger seat forward, being controlled from the right rear seat?
The other drawback to the 7 series is the weight; 4900 lbs. The 5 series is 4343 lbs. However, the M3 weights 3726 lbs.
Personally I think the M3 and it's much better power to weight ratio, and the fact that it has a normally-aspirated engine that will likely be more reliable in the long-term makes more sense. It has a back seat that's fairly comfortable and has a decent amount of head room.
The other issue that I would take into consideration is the fact that you can buy 3 year old 750's for half of the price of a new model. If I were to go in that direction, I'd get a 2009 model.
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