Honestly -- I'd just keep what ya got.
But if you're bent on a new car, I'm partial to the Corolla XRS.

The base models are nice, but they don't have any balls -- and the stupid 05+ base models are DBW (crap on that!). Unless you're planning on boosting it, I'd recommend you hunt around for an XRS. I've seen a few on ebay used as cheap as 13k and still well under warranty.
I pitted my XRS against a 3 (and having been a former Ford Focus owner -- the 3 is all the rage among Focus drivers b/c it's based on the Euro Focus platform) and frankly, I wasn't impressed. Yes, definitely a nice car with great styling -- but I didnt get the "fun to drive" factor from my test drive (05 2.3L). The XRS is comparably/comfortably equipped, costs about the same, and is a little quicker than the 3. Only downside is the XRS aftermarket sucks donkey balls.