Can't decide on which one to get. There are plenty of new 2002 GTS ACR's around, which is my other choice other than the 2004 SRT-10. Far as I see it, the GTS looks way better and has the hard-top coupe, which I like so I dont loose my mellon when I roll it. But the 2003-2004 models have the HP, 500 from the get go, easily upgraded to 550 or even close to 600 with bolt on modifications. To get 550 out of the GTS you would be adding 100hp to the stock engine, not as easlily done as it is with the SRT-10. ANd the SRT has the "modern" advances, the GTS is older technology. And for the money I hope these Vipers whip a** on my Z06, or I will be dissappointed