I'll add my vote for a single de hqi mini pendent. Cheapest I've seen for a 250W is $315 at marine depot, that's with a 10000K ushio de bulb. Trying to light this tank with florescents is a mistake, IMO. Plus, if you get the pendent, you can hang it over your tank some distance from the water, and leave the top open. This will really help with the heat issue. If you want to keep any shallow water photosynthetic animals, I'm pretty certain PCs won't really cut it. You'd have to cram so many in the hood and keep them so close to the water you'd have heat problems anyway. Plus, a hex tank is the right shape for a single pendent.

I'm not familiar with your filtration set up, so i can't comment, other than to say that the vast majority of successful reef tanks use no mechanical filtration other than protein skimmers. The remora pro is probably okay for this size tank, provided you get the mag 3 option. It's pricey, though. Maybe premium has a slightly damaged one on sale, I can't remember.

A couple of things I didn't catch from your post were flow plans and calcium/carbonate replenishing. You'll want to figure out these issues as well. Especially flow; with enough flow and the right bio community, detritus shouldn't be a problem. As long as you're in the spiny mode with the lionfish, I'd suggest a diadema urchin. Excellent grazer, and I don't think the fish can eat one.

Its nice to see a "newbie" who is planning well and thinking about the animals first, then the set-up. Good luck!

Matt