There are several cleaners in your price range, in addition to the Aquabot, from the Blue Pearl from Blue Diamond (which people RAVE about) to the new Dolphin Nautilus (a friend just ordered this so I'm looking forward to her and her husband's experience. They claim it uses a laser guidance. Reviews I've seen have been excellent ). That's at least 3 choice. My preference would be the Blue Pearl, because I use the big-brother Blue Diamond all the time. But don't go by my bias.

Carl