If you want something that is reliable 4cyl. then check out the MR2. It's 2.0L 200HP mid engine RWD. I'd suggest getting a 93+ version for the upgraded rear suspention. Then again I'm kinda bias because I've always wanted one as a DD and keep the Z32TT for special occasions.
They are reliable cars and will support heavy mods pretty well. BTW its in the price range that you are looking at.