Are the tanks going to be side by side but on different levels? If that is the case you might want to try drilling the tanks yourself, just pick up a bit at HD or you can ask around on here and see if someone can help you out! thats how i got mine done.
But if you do decide to drill it this is a great design, its only one hole and an overflow box
http://www.youtube.com/watch?v=pnng4xteNOo
the design of the tank is here, its basically a return pump to the top tank and then an overflow box to the sump of the lower tank
http://www.reefcentral.com/forums/sh....php?t=2016108
If you don't drill it i'm sure it will still work with a little adaptation so that you can run a continuous syphon to the lower tank from the top.
Best of luck!