The more expensive systems are closer to 1:1 good:waste. That's still 50% going down the drain and for the extra $$, you'd have to waste a HELL of a lot of water to make up the difference. If cost isn't your only concern (good for you) then your options are really only those already mentioned (all of which are of limited value and are generally a PITA !).
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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