The RX-8 seems more like an older man's mid-life crisis car to me, while the G35 is more of a normal old man's car.
If you want to pick up chicks, I think the last gen of sports/GT cars is the way to go. FD RX-7, Mk.IV Supra, whatever gen the last 300ZX was... I don't know, those still feel like "new" cars to me though. :dunno: