I checked out the pet shop yesterday and they've really expanded their marine section - they've got seahorses, darterfish, clowns, damsels, lionfish, tangs, and triggers, so I know I've got a good place to get some fish from when I start stocking. They're the only shop that gives good advice and sells useful products, which is a big plus.
It's weird, but I'm still getting used to the idea that I can have more than just a few fish in my tank. When I think of marine, I think of just a few fish, so when I read about grouping triggers, I just think of a packed tank. I've been browsing Live Aquaria for ideas, but there are just too many options - my head's spinning.
Thanks for your help, zenoxa - you always give me really informative answers, and thanks too, Colin.