Well... Now I have a dilemna. I just won an auction on an XP4 on Ebay, new one with all the media for $145, shipped.
I think I'm going to end up with the AquaClear 110 on my 46gal. Or I could put the Eheim 2217 on the 46gal, and run the AquaClear 110 and XP4 on this tank...
It's nice to have options!