John what's your head pressure? If I remember 1/2 SS can handle a max of 550 GPH so calculate in the head pressure then find a pump that doesn't exceed 1100 GPH at the return height. If it's more that ten feet I like Reeflo pumps.
I just got a jebao 9000 for my 120 and i love it. Its a DC pump and uses less electric than the mag 7 i was using on my 90 gallon and pumps way more water.