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If you do not need insane amounts of flow, the high pressure low flow pumps hold up better and tend to be more reliable. Keep in mind a 5 GPM low flow high pressure pump gives a true 300 GPH, where as a 1000 GPH high flow low pressure pump only gives that in a full flow situation (they slow down alot with plumbing, head, and if you are filling at the bottom of a big tank).
The low flow high pressure ones do chew up more amps but have the benefit of being self priming so do not airlock. Just get one rated for constant use as otherwise they can burn out.
Jon
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