In your price range, I second the ADK TL suggestion. They sound fantastic and are very versatile. They are a bit on the large side, but if you can deal with it, they are outstanding for not only that price, but for any price. If you like the AKG sound, you may also want to look into the AKG Blueline series (39x). You can pick up a used set in your price range.
At any price, the Gefell M270s can't be beat for omni patterns.