Hlg-320h-c1750b was the one I recommended earlier. That would need a potentiometer hooked up to it to be able to dim. I usually don’t recommend the b to first time builders for that reason. But when the dimming circuit is left open, they’re 105-108% of rated output current. Do you get a couple of bonus watts.
If you switch last spot a instead of b, that has built in potentiometer. It will let you dim from from 100% power down to 50% power, without you doing any additional work. It’s a real nice driver too, but doesn’t have the bonus output.
Going to the hlg-480-2100 a/b is a good choice too. That would actually give you the headroom to add another board later if you wanted. I don’t think you’ll need it, but the option will be there. 2100ma is about as high as I see you wanting to run them though. So my personal opinion is that you don’t need the 2800. And I would look around at pricing too, as arrow recently raised their prices. Trc, or one of the diy grow light suppliers may have a better price.