Well for a FOWLR
, 10-20x turnover per hour is recommended as the minimum. 30-50x for a reef minimum.
For a 29 gallon you're looking at 580gph minimum. You would be fine with the 425 and the 550 technically, but it's sorta up to you. Some people like a little more flow in the tank, and realistically, unless you are beating fish up against the side of the tank, I think you're fine.
I know that Carey used (2) 750's in her 29 and thought it had very good flow.
Thats basically the same as your 1050 and 425 combined.