I recently bought the 1050 Koralia Evo for my 90 gallon tank and it is way too strong. Even bouncing the current off the glass it still blows a pit into my substrate and leans my stems at 45 degree angles.
I vote for the 750 as well unless you have a 6' tank.
I now have the 2 nano 425's and the original Korelia rated at 400GPH in the tank. This is working out really well. Any of the stronger units would blow the plans around too much, I think.
I have one unit down low, aimed down the length of the tank, across the foreground plantings. The second is up high, aimed down the length of the tank, but also reflecting off the front glass to spread and break up the flow some. The third is on the back of the tank angled to send flow in the same direction as the other two. It is sending it's flow through the saddle of the U-shaped aquascape.