Ok.. some pumps come with a data sheet that tells you how much the flow rate drops with pressure. The Mag Drive pumps I have here have this chart published... IIRC, it looks something like a bell curve. The max head pressure is the maximum head pressure it will still pump the TINIEST amount of water at.. ie, it will pump nothing over this pressure (the zero crossing point, with X being pressure and Y being flow).
I believe (as I've read from other people) that the Little Giant pumps (except the small, black plastic ones) are a bit better for pressure than other pumps (I've noticed this too). Also, my Little Giant pump is noiseless. I can't hear the thing at all... when I tried a Mag Drive, the first thing I noticed was the noise... really bad.
The only thing is that Little Giants draw more current than Mag Drives (my 205 GPH draws 1.1 amps @ 110 VAC, and is submersible...). But it also has a higher max head pressure than a 250 GPH Supreme mag drive pump. And for size? It's about the same size as Mag Drive.... but it's not a plastic casing... it's metal.
Good luck!
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