Here's my take since the OP never responded to my post:
1) G35 coupe if you want luxury/backseat/trunk. Essentially the same car, but expect to pay over $6000 more for a 6speed versus a 6speed Z (Enthusiast Model).
2) My '04 Z has 3 rattles right now. 2 in the dash, 1 in the rearview mirror. I'm a picky guy and it bothers me to no end.
3) the engine is awesome. it's my daily driver and M-F there's traffic going to work. I can't WAIT until the weekend to strech her legs out.
4) there are more G35 than Z's in a bay area if you care about that stuff.
5) She's a porker. 3,200 lbs according to nissanusa
6) 23 mpg average