I have been using Garage Band for years now, and its well-known limitations have actually pushed the boundaries of my creativity, and forced me to come up with creative solutions to work around them.
However, after 6 years in the Garage Band bubble, I feel I could benefit from an upgrade in software. Absolutely everything of any value seems to be unavailable for Mac OSX.
Can any mac-using ponies make a recommendation? I'm running Snow Leopard, and I'm not willing to create a Windows partition.
I do a lot of orchestral work, but I also do a lot of composing for synth instruments as though they were an orchestra, plus your basic rock/pop stuff.
-Sprocket