How do you want to run your COBs? Power or efficiency? I run Meanwell 240 2100mA type A(built in potentiometer) Constant Current drivers for power. I can pull 304 watts at wall with 3 Vero 29 Gen 3.
For efficiency, I'll parallel 2 together and make 3 pairs in series, total of 6 Vero's on 1 240/ 2100mA ( 50 watts ea. ) There are so many combinations you can run. Do you have a problem with heat? QB's are better if you have heat issues. I by 90% of my stuff from RapidLed. Tell you what, If I was you, I would invest in some of Growmau5's Logic Pucks.
They are one of, if not the best grow light in the LED market right now. My .02