Hows the ALLBLACK on sale at captivereef?
I've never used one, I personally prefer an overflow that uses U or J tubes, that one looks like it uses the C bracket like a CPR overflow. I would pm Darrin at aptivereefs and ask him for some input on that overflow.
If it were me, I would go with CSL over coralife, hands down. The only problem I have with them is that CSL is no more, they closed their doors last week. I have had a CSL MH
prism pendant for 5 years of continuous operation and it has never given me a moments problem (knock on wood), they have excellent quality and I believe the distributors are honoring any warranty and service agreements for CSL products.
On the power issue, before you get to worried get a second opinion. Several years ago I ran an entire 150g reef, 750W of VHO
lighting 4 large powerheads, a large waterpump for the skimmer and an even bigger waterpump for the tank and a chiller...all on one circuit, but I don't think it was the smartest thing I ever did, LOL