Matt--
Sounds like you had a good trip in seeing different models and build quality--that's good.
BUT, don't say that 300/400 HP will be good enough--it won't.
As soon as you get used to driving that monster and your at 350 HP, you'll want more--believe me.
So, keep looking as you described, form an opinion, and buy up. Also shoot for 450/500++ HP
Just my .02
Mark