I would suggest the Eheim 1250 if the Mag 3 is unavailable. There is not much (probably not measurable) difference between the standard pumps, due to the fact that they all fall into the 1-2 GPM range. And, Eheims are very high quality. By the way, blocks are actually becoming less resistant, but people have only just realized how important head pressure is, due to the testing done by pHaestus with the MCP 600.
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