RENA XP3, $89 bigalsonline.com, can't go wrong with that. 350 Gallong per hour, up to 175gal.. I have two XP3's and one XP1 running on my 60 gal.. GET THE XP3!!
Here's a little comparison chart of a few different cannisters.. I thought it was kinda helpful.. http://www.drsfostersmith.com/pic/article.cfm?aid=426 I personally like how the Fluval 05 is "very effective" for each type of filtration according to this chart. I hope it's right.