Well i don't even consider the srt-6 and 350z in the same league. If I had to choose, I would choose the srt-6, just on the fact its more expensive. But if you don't mind paying over 10k more for the srt-6 and driving an automatic. It is the better choice.

And with a few mods on the srt-6, you can be in the 12's. All you need is a pulley and chip and you got the power to hang with an 03 cobra. Sorry to say the SRT-6 is a better car than that of the 350z.

But for the price of the srt-6, I would look more towards an E46 M3 or a C6. As those cars have it all. Or if you want ***** out speed wait for the new 450hp plus Shelby GT500.