Nightfall, I don't know about having a RWD vehicle in the environment you describe. Even with Blizzaks I would think an AWD vehicle would be a much better choice. I own a Mustang with ~370 hp and I wouldn't dare drive it in the winter here, Blizzaks or not!
I was thinking earlier that the G35 with the AWD option would be your best bet for a combination of performance, practicality, and refinement. My choice for a daily driver would probably be the STi, but then again I'm mostly after raw performance at this stage in my life. The G35 is a great looking car and the AWD option would make it very drivable in the conditions you describe. I know the lack of the 17" wheels on the AWD model is putting you off, but I doubt the car would be very capable with the stock Z-rated tires, even with AWD. You'd probably need winter tires (or all-season tires at the very least) so you're looking at replacing the tires anyway. The suspension upgrade would improve handling but would almost certainly reduce ride quality, so you may be better off passing on that options.
Well, those of you who have commented about the likely negative experience that I would have with the G35 coupe in snow are right, I'm sure, the more I have thought about it. BUT, the G35 sedan which you several of you are recommending, and which was one of my early choices is now completely out of the running. Besides not bring able to get the sport package (larger wheels, tires, better springs, shocks, etc.) with the AWD option, and also not being able to get the HIGHLY desirable aero package with it either, I just now found out about the absolute final reason I cant even possibly consider this car. The AWD model is only available with an AUTOMATIC transmission. YOU CANT EVEN GET A STICK!!!
What the HELL is Inifiniti thinking???
JC