I used PS Elements 6.0 because it went with my tablet but I donīt like it much...some essential things from the full PS are missing...
I recently got PS CS3 and Iīm so very happy with it, now I donīt have to use Gimp (2.0) for making linearts...tho Gimp sure has some nice brushes itīs just too circuitous for me.
My very favorite program is SAI, itīs simple and quick to use and has just the right brushes (e.g. water) I need for my favorite coloring style...sadly I donīt have the money to buy it =(