A good thing is to surf for what out there in your price range. Get an idea of a few you like and the post them here to get some users pros and cons.
If you like to goof around with different sounds at the push of a button go with modeling amp. If you like looking for your own sound get a tube amp and learn hot to set your amp and guitar.
A nice little amp I've heard good thing about is the Roland Cube.
Good luck with your search.. I sure you'll get plenty more advice..