Some noobish questions for you dudes.

I really want a car that's gonna smoke my roomate's mustang gt (07) and my buddy's subaru wrx (non sti). After having watched vanishing point and talking extensively with a buddy of mine who had several challengers back in the early seventies I've decided this is the car for me.

Is the 6.1 going to be enough to meet my "requirements"?

I already have a savings account started to put together a $20k downpayment. Going to take me a couple, maybe three years to get enough in there to do this. I'm hoping I can get one out the door for no more than 40. Am I in for a rude awakening?