I've been dealing with this myself recently. I have an older version of PS (6.0) that's great, but won't run in OS X. So I've been using a copy of Elements in X.
I'd say if you're new to digital photography, try PS Elements. It really does about 95% of what you'll ever want (or at least, it does about 95% of what I want, and I've done PS stuff for years), and it's a fraction of the price. You can always spring for the full version later if you need it.
Good luck, and have fun.