Matt,
you're getting a lot of good responses, so I'll just offer a couple of tips. First, get all your beer/gas lines, disconnects, t-pieces, clamps and beer line cleaner from Andale in Coorparoo. Much cheaper than the HBS. Second, consider buying a second hand fire extinguisher as your gas bottle. I got mine from Blaze Fire Protection at Loganholme, filled for $110 (5kg). After putting in the order, it took a month for one to turn up. Hoops got his within a couple of days. Just depends on what they're getting in at the time.
If you want to talk kegs, I'd be happy to chat some time. PM me if you're keen.
Cheers - Snow