If you are going for class and to drive chicks, or more that one other person, I would go with the G35. If you just want something more sporty and something you can rev really high, go with the RX 8.
or 2005 mazda rx8? these are my three favorite cars they are all stock and have below 50k miles so keep that in mind
this would really help me out on my decision
i've driven all three of these...
1) the g35 was the fastest, but kinda disappointing and easy too easy to let the back wheels free.
2) the srt4 was a fun one time drive (turbos are great to plaster you against the back of your seat), but is a really shitty car.
3) the rx-8 was extremely smooth and fun to drive, with much more control than the g35, and also more room in the back seat.
Basically, decide whether you want to have fun without killing yourself in the rx-8 with a reasonable back seat.
OR
Go crazy and be all over the place with the g35 and have nowhere to store anything.
P.S.
and with the traction control off on the g35? forget about it.
Test drive them both and go with what you want more!
I have a Mazda RX-8 and it is the best car I have ever had!!!!
I love it! And there are so many upgrades and accessories available to personalize it. I will keep have rx8'x until I have kids or something when it'll be too small.
People don't realize its a 4 door either (which classifies it as a sedan for insurance purposes, nice!) the suicide doors are so cute... everyone loves it! And i do too!