But the FL Moog sounds really don't do it justice.
Check out Arturia Moog Modular V and Minimoog V. The creator of the synth, Robert Moog, worked with Arturia on making the synth. and it's so perfectly emulated, I couldn't tell the difference.
The programs are about $200 a pop, so if that's out of your price range, check out MiniMogue VA. It's pretty damn good, and is absolutely free.
You could try the demo version of the Arturia synths but the demos make that weird buzz every 45 seconds, but it lets you fool around with it.