Meijiu and kingbrite have both worked well for me. Try to run the boards a bit softer than standard 120w per, 60-80w and you shouldnt have to worry about burning anything down.
4 boards centered over each corner, and then some boards in the centre on a separate driver.
Get drivers from not-china, anywhere where you have an easy option for return in case of warranty. China is not worth it, shipping your unit back is going to cost more than a brand newone.
@60w per board you shouldnt need pro heatsinks, 1/8" alu sheet with 2" lip on each side and your good.