I would stay away from that and go with a conventional sump. It would be a lot more versitile and you could customize it to suite your needs. With this hang on back you really can't put any extras in there and for $250 (I'm pretty sure you could find it a little cheaper, that was just the first link) you could have yourself a nice sump, with baffles, a return pump, and have money left over to help with your skimmer costs.
I have wet/dry AMIRACLE is currently connected to my 40 Gallon. Going to bring down my 40 and start my 75 Gallon. You can have it for $75. Its not a hang on.