Re: head swap
I think it would be worth taking a look into it, in this month's Car and Driver they say the new 3.5 engine is based on our 3.2 so it may work, but I assume it's no plug and play job.
I'm not sure about the numbers but I figure 5K is an understatement, I agree with x'ed, I'd rather modify my car than get an SRT.
I'm still drooling over that 12k Kleemann supercharger!!!