I like the G, the back seat is not that bad, compared to the RX-8. I fit, two 6ft tall people into the back of my car without any problem. Well, it's kinda Biased since I own 1.

However, it's very expensive to play with. For the money, look, etc. I say go with the RSX. You can make that thing fast and look really nice for a fraction of the price modding the a Z or a G or an S2k.