There aren't that many reasonably priced pumps out there to run a needlewheel...
About the only ones out there for a reasonable price (IMHO) are the ocean riders - 2700 and 3700 both come in under 100$ (with the needlewheel - the eheim 1260 looks reasonable until you realize the impeller itself costs more than the pump).
What you may want to consider for the actual construction is to remove the becket head altogether, feed water in through that tube, then use a venturi/needlewheel recirc rather than trying to rework the whole system.
Andy
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