They don't make it anymore, but if you can find a copy of Fly! for cheap (I bought one for $5 a few weeks ago), you won't regret it. That was my first simulator back when I had a Mac (can anyone guess why I turned to the dark side?
), and even though it was five years ago, it still beats MSFS silly in a few areas (panels and clouds).
I recommend Fly2K if it's compatible with the current OS
versions. If not, Fly!II will suffice. You might want to look in the Avsim forums, where there is a bunch of Fly! devotees who are trying to keep the program going (the distributor rushed a really buggy Fly!II out the door way before it was ready, apparently so that it would die a quick death - which I guess it did, and the responsibility fell to third-party programmers to do what should have been done in the original release). Be warned, you'll have to do some patching, but it's still very worthwhile at the price.