How hard do you want to run them? I've read that these boards can be pushed a little harder with their only limitation being the heat sinks. They'll do 3200 max mA
I'm going to run two of these boards on a HLG-320H-C2800A so 2800 mA.
You could pick up the HLG-480H-C2800 and run them each around ~155-160 watts per board. If you want to back things down a bit, you could do HLG-320H-C1750 (1750 mA) or HLG-480H-C2100 (2100 mA).
@Stephenj37826 would be one of the best people on here to guide you on that.
Good luck!