The GTO is going to be cheaper because its not in the same class of car. The CTS-V is a luxury sports car.. the GTO is just a sports car. You are going to see a ton of GTO's running around any given town, but the CTS-V will be a rare vehicle.
I want a combination of luxury and performance, and the CTS-V can give that to me, while the GTO cannot.
You mention the SRT-4, and it is a great performance vehicle with alot of bang for the buck... and, its a VERY stout car.. with that said tho, I have seen people break the front diff on the SRT-4 too, mostly from wheelhop, and mostly from people who stay into the throttle even when the thing is wheel hopping.
The same goes for the Supra.. I've seen the stock rear diff take the car into the 8's and I've seen people break it on 12 second cars.... if the car starts to wheel hop, you need to lift and try again another time.
I have managed to take off from a stop and accelerate very quickly (using my butt dyno) without experiencing wheel hop... so it is possible.