[thincat]

Did you say you were going with a fish only with live rock setup?
If that's the case you don't need live sand and you could get away with a cannister filter. You might not even need a skimmer, you can control nitrates with water changes. All these come into play if you go with the reef setup and most people end up there. Power heads are nice, then again you don't need them in a fish only setup as long as your main filter has enough flow. You could even go with NO lights! PC lights for corals are lacking in enough penetration and thus T5's are a better option, but fish only is a matter of taste. Even Black lights would work if you like that sort of thing.