In that price range, if you are looking for a modern, bright, big, aggressive sounding head (i.e., bright with lots of upper treble, etc.) the GK MB500 is hard to beat for the price. I'm not a fan of the MB200, but that is a REALLY low priced head that is quite a bit of the MB500 sound in a very small (and a bit cheap feeling) package.
If you are looking for a more fat, organic, growly, warm type vibe, the Aguilar TH350 is amazing, and is uber quality, and seems highly reliable.
All are well within the top end of your price range if you shop during one of Musician's Friend's typical 10% or 15% of $50 off sales events.