Without going into technicalities, I can use both GIMP and Photoshop. Reason being because I initially started out not expecting to go beyond doing basic avatars and sigs. So I learned how to use GIMP. It's good, but be wary that if you want to go into complicated graphic design and such your only option will be to learn how to use Photoshop. Meaning you'll be faced with no option but to go through the process of learning again.
But it depends. I became keen to learning everything after I knew the basics. You may be content just to master GIMP, you can make some awesome stuff with it. *IMO the best sig I ever made was with GIMP. Really knowing how to do flashy stuff with photoshop won't make you a great graphic designer.
Originally Posted by WanderingKnight
Not to say anything against any of you--but how many people exactly pay for Photoshop, considering its price?
Not me. *Google - Youtube - Download Photoshop CS3 for free