I would get the mp40w myself. People suggest 50x turnover, but I'm sure the 30x would be enough. Before I got my mp40w, I only had 27x and didn't have any issues. The main reason I say go with the mp40w is if you do want more flow, you don't have to go buying another pump.
Another thing you could do is buy 2 of the mp10's, but you can't run them together wirelessly like you can with the mp40w.