I have a MD20RLT, a MD15RLT........420 gph and 300 respectively.....
Great pumps.......quiet and reliable........
Here is a link to the best deal I could find on the MD20.......note there is a 15% special running on all their Iwaki pumps......making the final price around $122.......shipping was about $9 from CA to GA
here
They shipped fast too.......