Beagleboard SGX drivers is still under development - forever and ever.
Pandaboard ES is getting really hot. The result - CPU changing clock constantly from high to low. You should install serious cooling system on it.
This one - ODROID-X - is really impressive with customized distribution of Android. This version of Android includes Dice player, that can use GPU hardware decoding. And there is XBMC patch for using this player. The board has great community support.
Ubuntu distribution is still missing graphic drivers.