I plan on simply using 2 HOB overflows - a Lifereef and a cheaper Hurricane as a "backup" (although both will end up flowing about equal amounts).
I'll be using an Eheim 1260 as a return (~450 gph at a 4' head) so either overflow can handle the load even if the other is completely shut-down (Lifereef 600 gph max flow, Hurricane 500 gph max flow).
Both overflows are the more reliable u-tube design and since I picked both up used, cost is very reasonable for the resultant peace of mind.
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