dude use adobe photoshop. I can sell you the portable version which is only 55mb!!! it's the best program out there.
If you really don't want photoshop, then try corel paint shop pro as suggested, or the gimp. They are both very good. I might be able to get low disk space versions for you.
Eh wth do you mean by "need more photoshops" Photoshop is a certain program created by Adobe. Use that one, no program is free if it's as good as photoshop. Gimp is free but it's pretty crap. Other than that you're really asking for the impossible.