Cool that should be plenty of room in the sump.
As for the Chinese lights: All I know about them is what I read. Some love them, some tell stories of pain & suffering. In general life, I do know that I'm rarely satisfied when I buy bottom of the barrel. If you have experience keeping corals, you're more likely to have an easier time with them I would think. But those are just my biases
I'd do some research & go with top diode manufacturers like Cree, Phillips etc. At a minimum I'd insist on multi channel dimming and flexibility & options regarding color temperature. The amount you have to spend is a personal thing, but the latest generation of quality LEDs are really nice & have come down I price.
I'm not sure about how many 165w Chinnese LEDs would provide adequate coverage for you.