I'd say check into the Volvos, they are pretty decent, have the possibility for aftermarket bolt-ons, good gas mileage, very dependable.

http://www.autotrader.com/fyc/vdp.js...5000&cardist=2

OR

Check out the Vdubs as well. Here's a 2003 Passat GLS:

http://www.autotrader.com/fyc/vdp.js...5000&cardist=8

OR

Also check into the Audi A4. This is a nice, roomy sedan with some decent aftermarket:

http://www.autotrader.com/fyc/vdp.js...5000&cardist=2