if you are good at DIY, make a Maxi-stream. Its basicly a tunze but all you do is buy a MJ-1200 and some extra parts, maybe 10$ worth. And you have something that blows the tunzes away.
I've made a few, amazing things for next to nothing.
Take a look at this thread, its a great resource to build one of these.
http://www.reefcentral.com/forums/sh...hreadid=871507