So I was doing a bit of measuring this evening when I encountered a little problem with my sump plans. I was planning on using my 30 long as a sump, but it won't fit in my stand (without modifications that involve a saw).

I have a 20 high, but I want a lower, longer tank for my sump. Besides, the 20H is my quarantine and I've run some chemicals through it (none containing copper) and I don't want to chance contaminating my display.
My new plan is to get a 20 long and use that. I know the 20 is plenty large for a 90 gal display, but the 30 would've been so much nicer. Oh well. Que ser? ser? right?
The only piece of hardware I'm contemplating at this point is the return pump. I'm going to have a fuge in my sump, so I don't want too much water flow, but I need enough to keep things fresh. Any suggestions/comments on a quiet and reliable return pump?