I'd love to drill, but two of my tanks are tempered all around, so I'll be putting overflows on at least the nice one to sump the heaters, skimmer, refugium, and to get a little more flow/aeration in the tank.
Thanks for the link mltmtascp, that's much better than the LFS near me selling a 250GHP setup (w/ Aqualifter) for $103, on sale, normally $135.