well, i use Photoshop Elements, which is essentially Photoshop, except it has a few less options, and it costs a bit less. I think the regular Photshop Elements is like.....300 bucks, but the one for Mac is around 80. I've also heard of a program called "Ulead", but i know absoloutly nothing else about it. hope that helped!
<3,
Narnia_princess42