RE: The 6.4 mystery
I would buy a 6.4 Liter SRT8 Challenger if they made it for a nominal upcharge to the 6.1 SRT8. If it were a substantial increase, I would need to weigh other performance cars as options as well as the exclusivity this choice - one of 500 or better will probably get my attention. The 09 SRT upcharge is already putting some exclusivity on this model over the RT.
I love the looks of the new generation Challengers and the original E body Mopars, the ability to seat my entire family of 5 eliminating a second vehicle (with at best gets 25MPG at worst gets 11 MPG Premium) when we go cruising.
Eric