ive always had 7 until i got my new computer. then i got cs until i found out i had the trial. then i just put 7 back on.
I have CS, 7, and elements. I use all 3 to make sigs, expect elements I hate it but it has alot of filters etc.
I use CS and the only thing different between the 2 that i noticed is the 3d render thing which isnt in cs which i then got later on and put into my plugins folder