The new GT500 is a beast, but not under 45k with the creature comforts
The 5.0 is a pretty fast car, a lot faster than some give it credit for, but yes the interior isn't all that great.
I saw a Boss 302 on the lot yesterday when I took my truck in for service. Wanted to check it out but didn't have time. I've heard good things though. Go for a test drive and see how you like it.