Matt,
Are you planning on dumping one of the overflow drains to the 'fuge? I used to have mine plumbed that way, but I was always getting a ton of
detritus piling up in there. I now have it plumbed off the return and all the raw water goes to the
skimmer first.
You may also want to give yourself a port and valve so you can stub off and add accessories like a phosban reactor off the return pump. This will eliminate having to add more little pumps down the road.