First of all, Welcome to Canreef
. let the addiction begin!
Personally (and this is just me) I would stay away from the cube and go with a custom build set up or something used. This way not only do you get more bang for your buck but you also get the experience that goes along with doing a tank build (which is priceless in my experience). Go to
http://reefkeeping.com/issues/past.php for lots of great reading!
Good luck, stick with Canreef and you will be pleasantly surprised with what you will learn. That and find a good LFS that cares more about building you a healthy system then making a profit.
Levi