[NISSANSPDR]

Let me tell you right now...you cannot get a STi or an Evo for under 20k...I wish that was true but it's not

A TL would be a good choice if you wanted luxury and the space...but I would stay away from it

A Maxima would be a good balance of practical and some umpf

I would stay clear of the Sunfire for sure...

Other cars to consider:
Mazdaspeed Protegé (4 doors, handles really well, and turbo 170HP, and looks great)
Neon SRT4 (4 doors, decent handling, wicked fast, under 20k so you can get one new)
E36 M3 (4 doors, amazing all around performer, luxury and space)