I vote for a Volvo. It's got sleeper written all over it. I'll probably be looking at the '06 V50's in a few years when it's time to replace my truck. 218hp turbo I5, with a 6 speed manual and AWD. Plus it's a wagon, so you can haul around a keg or two.

Or if that's not your thing, the S40 is the same car, but it's a sedan.