I just purchased a Filstar XP2 for my 55g community tank and really enjoy it. It's my first cannister filter, and I don't have much experience with cannister filters, but a few features really impressed me:
First off, this filter is nearly silent. There's a hum when I have the stand's cabinet open and that's it.
Secondly, the number of different set-up options out of the box are pretty impressive. The inlet fittings allow you to run the inlet pipe all the way to the gravel if you like, or just below the surface, while the outlet pipe has fittings for a spraybar (settings for horizontal or vertical spraybars) venturi, and a powerhead-style nozzle attachment for more current.
Finally, this filter is really easy to maintain. (Yeah, I just got it, but shortly after it was all set up, I decided that I wanted to tweak the media a little... Doh!) Just unplugged it, popped the hoses off (includes a sort of switch that keeps water in the tubing... no broken siphon or water everywhere) and took the cannister to the bathtub.
All in all, I think it's a pretty sweet piece of equipment. At $70 plus shipping from Big Al's, I thought it was a pretty good deal (media's included).