I'd go with the 2 MP10's, I had a standard 75g with a MP20 on it and it wasn't enough, I think you would be better off with the different flow patterns of 2 pumps in your cube.
On a 60 gallon cube I run one MP 40. The tank is sps heavy and I haven't had any issues in three years. This is the first generation of mp 40's so i don't have all the slick wave modes on it.
sorry to ressurect an old thread, but if i got the two MP10 route can you wire to ES together and have them work like the wireless models that sync with eachother and communicate what the other pump is doing or do I have to go with the wireless drivers? Also what is the big advantage of having them sync togehter? Is it really worth the extra $50/pump $100/total investment?