Can I get away with an internal pump?

[Myka]

Another thing to consider, you could install your sump on a platform and raise it off the floor 4-5 feet and still have lots of room to play in it (assuming 8' ceilings) which may be the difference between using an internal and external. Just make sure you design it so that you still have easy access to the sump.

[Reef Pilot]

The Sedra 20000 is an excellent pump for high head pressure, much better than the Mag pumps (which I have also tried). I have had one in my basement sump, pumping upstairs to my main display running for 6+ years with no problems.
http://www.jlaquatics.com/dry-goods/...ater-pump.html
They put it on sale sometimes.

It actually runs two tanks (another one downstairs) as well as a couple reactors, all off a set of Ts in the sump. And always starts reliably after a power outage (unlike the mags).