Aerofly RC7
When it comes to simulators for OSX there is really only one option, unless you want to get into parallels and stuff. Aerofly is a great simulator, but its $40 for standard, and then you can get professional for $60 and ultimate for $100 or something. What I don't know about it is if I were to get Professional, would the price for Ultimate go down? Aerofly RC7 Standard comes with a lot of planes, including a ⅓ scale Sbach 432 (insert happy face here) and an adrenaline 120. it has a range of gliders, some like the radian, I think it even has a Bird of time, and one HUGE one that has retractable gear. There are also a large handful of "other" models like a ½ scale Wilga, a F4U corsair and A pitts and a gee bee. As for helis, it has 2 nitro helis, a tiny little t-rex 450 and a couple other acro and scale models. Over all, I love it. All you need is any USB based controller, and almost anything will work. If you want to use your own RC controller with the sim, you can get a USB adapter.
http://shop.ikarus-usa.com/en/home/745-usb-interface-for-aeroflyrc7.html You will need to get a separate "mini-cable" thats specific for your type of radio. Ikarus part numbers 303101, and 31036. Its a bit expensive, probably $100 for the whole sim (assuming that you got standard, you got the USB adapter, and radio adapter). The graphics are REALY nice, especially if you have the beef in your Mac to run the higher res scenery options and stuff like that. I have 8GB ram and I can run the medium scenerys with minimal lag. Good luck!