Laining D5 is the industry standard, but my vote is for the Laining DDC pwm. The MCP35x is a hell of a pump. I've been using mine for about a year now, and never had issues with the overheating some people complain about. I think that issue must have been fixed with the MCP35x, because it's only the older models I see having issues with it.
It has superior head pressure by a notable amount, and is about 20% more efficient at 1GPM (The standardized flow rate you want to get.)
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