From experience two things I would avoid:
1) Multiple pumps - more issues relating to consitant water level
2) Pumps mounted vertical - start up issues & propeller wear issues.
The diablo looks like the better choice of the three you posted but my advice would be to consider an alpha for you low end and BK double cone DC for your upper.
Last edited by sphelps; 06-26-2013 at 05:35 PM.
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