Ryan if you want to build your own, you can check out my led thread and also the parts list post (
http://www.canreef.com/vbulletin/sho...4&postcount=12) with the prices and links which im keeping up to date
your tank is slightly smaller than mine so it would be close to the same LEDs. Im doing 144 LEDs instead of 120 but I think you would still need to two 3 modules unless you only have one brace in the middle for 5 foot then you can do two big modules.
I could build one for you for half the price of the commercial ones but if you have time, and are not in a huge rush to setup your tank then I would just build one your self. Its really rewarding and you dont need to know too much about electronics. the hardest part is probably soldering and thats more tedious than hard.
Im aiming to do mine under $1500
also, do you have a controller? if so you can dim these bad boys and make a nice sunrise and sunset.