Originally posted by Jeb Hoge: Find an off-lease AMG Mercedes sedan.
I'll second this option. There are plenty of Mercedes 400/500 series coupes/sedans on the used market for great prices these days. I've seen several 430 coupes for well under 40k certified preowned.
If you want new, while I don't like the looks, the 300C SRT-8 is a low 13's car stock and right around 40k or a bit under even. I like the new Charger looks-wise better than the 300C, so I'd go for a Charger SRT-8 personally.