If you want the best, I really like my Polk Audio I-Sonic ES 2s, but that may be out of your price range. I have had Altec Lansing and JBL, both of which are good for cheaper. I have a set of the originals of these that still work, although they are nothing compared to the Polks. I have also heard good things about these. Logitech is usually nice too. This is the cheapest Altec Lansing that Apple carries.