Listen up the XP3 is the way to go trust me. They are so great I have one on a 55g with 2 emperor 400's I swear by this set-up. By the way if you want one cheap go here http://www.petsmart.com/global/prod...<>ast_id=2534374302023693&bmUID=1134796029939
print the page off and take it in to Petsmart and tell them that you want to price match with there web site price. It will drop the price from $169.99 to $104.99.
buy the way you can do that for anything that they have and the prices are right at that of Big Al's but you don't have to pay the shipping.