For you only, because you're got a res for the pump, I would
highly recommend the MaxiJet 1000, available from BeCooling (link on the ProCooling frontpage), for $20.
It'll give you a bit less than 6' of head, with a max flow rate of 265 gph.
If you really want to crank it up, get two of them, and run them in series (hold on to your clamps!)
Total head: approx. 10'.