Good to have you on the dark side Clay. Salt water and you're building your own tank! I am in the midst of building my own tank as well (360 gal starphire with PVC bottom).
I believe Live Rock, skimmer and some sort of physical filter is all you need. The fun part of this hobby is the variety of systems you can build and be successful for which you'll get lots of interesting/helpful advice on this site. You may want to start a thread in large tanks or DIY for you build. Best of luck.
360 Gal 72x42x30 - 110 Gal Cryptic fuge & 50 Gal sump
60 Gal & 30 Gal Frag tanks
3x400W MH - 940 W T12 Actinic - 90 W LEDs
Euro-Reef CS8-3
Deltec 601s reactor
1HP chiller
4xTunze 6100 & 6105
300 lb LR, SPS, LPS, fish & some softies