Try Duvel, Leffe, Westmalle, West-Vleteren, Orval, Chimay, ...
I've tried all but the Westvletren 12. It's damn near impossible to get over here and those damn monks are so stingy with it. Just kidding of course, I actually think it's pretty cool the way they operate, it just makes it ridiculously hard to get some in the states. If you got a hook up on some drop me a line.