I think for to run skimmers, heaters, etc. in your sump you only need about 5-7x turnover per hour for the sump. So for 96g + 20g (estimating water vol for sump) - 10% (for live rock etc.) you'd want probably about 104*6 (we'll just say "6" times turnover since that's the average of 5 and 7) = ~625 gals/hour at about 5' head (guesstimating the average head pressure for a sump return line).
Playing around with RC's head loss calculator and assuming 3 90 degree elbows, 2 45's for good measure, 1" piping, 5' vertical and 0.1 horizontal, I get 684 gallons per hour out of a Mag9. A Mag7 gave me 401 gallons per hour. So ... all said and done I think if I was looking for a submersible pump for that setup, I'd look at a Mag9.
RC's head loss calculator:
http://reefcentral.com/calc/hlc2.php
Unfortunately they don't list all pumps, just a lot of common ones.
Another submersible you can look at is the Rio Hyperflow, I have one on my 30x30x20 cube, it seems to do the trick pretty well. I forget which model now. The 26HF I think?