Welcome to the forums and 425 HP is not a problem. We are hoping for more and my get it. But if not, Mopar Performance can take you where you want to go. SRT-8 and a 6-speed in a Challenger will be a smooth ride. But I think that the HP from Dodge, Ford and Chevy will be close... but the styling will be different, very different. And that is where the choice will be made by most, then add cost. Good luck and I hope you get what you want.