Oh good. I'm glad you've decided to up the sump. I've got a 20 on my 75g, and I REALLY wish it was bigger!
I'm afraid I can't comment on the skimmer - I'm running a CSS (and am actually relatively pleased with it). As for lighting, though - for what you're planning to spend on that hood, you can buy 2 brand new 250w MH pendants, ballasts, and bulbs. You might want 3 of those pendants for a tank that size, but you very well might be able to find all of them previously owned on various forums for a great price. Just another idea for lighting that would easily allow for stoney corals, clams, and nems.