In applications I have used, a 1" drain will max out at a Mag7 but my head height was not 5 ft. If your not wanting max flow just get a mag 5. It is a great durable pump.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,