There are some American breweries that make outstanding Belgian styles... Victory's Golden Monkey tripel, Great Divide's Hades golden strong, North Coast's Pranqster, and Avery's Salvation, to name a few. Canada has the Unibroue brewery, and I really like all their beers, like La Fin Du Monde, Don de Dieu, and if you like them dark, Trois Pistoles. Belgian beers really vary greatly from brewery to brewery, so if you start trying different ones, you're bound to find some that suit your tastes. Malheur 10 and 12 are two of my faves, along with A'Chouffee. La Trappe (or Koenigshoven) make a pretty decent line of beers, (but they're Dutch, not Belgian). This is just the tip of the iceberg. There is a whole new world for Belgian beers out there.
As far as yeast goes, I like the wyeast 3787 or wlp530 (Westmalle) the wyeast 1388 or wlp570 (Duvel) and if you liked Chimay, try wyeast 1214 or wlp500.
Hope this helps...