Of all the stuff out there, I like Tobin's plates right now (coolhardware52 on this board). FredT (also on this board) also makes real sweet plates, especially if you need a heavier plate.
Tobin's site:
http://www.deepseasupply.com
You can't go wrong with either plate. Plus, as some of these guys have mentioned, ebay is your friend for wings. I prefer Halcyon or Oxycheq, as I've more experience with these.
Also, suggest you start off with a simple harness, hogarthian one piece...you don't need all the rest of it that many manufacturers seem to want to sell.
FWIW. YMMV.