I'm not the foremost expert on pumps but aren't fountain pumps working against a high head?
Perhaps looking at the design of those (or maybe even using one instead of the aquarium style pump) would be appropriate if higher head was desired?
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2.4c @ 274mhz fsb / Abit Ic7-Max3 / OCZ Permier PC4200 mem / Radeon 9800 Pro
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