Formatted a CPU? You mean Hard Drive :P I haven't been on Artpad in like 4 years, looking in my old favourites, I think I still got some good ones saved :D. TBH no one needs CS, least of all for making sigs or even painting digitally, you will never be really needing those 'extra features' anyway. sooo... IMO 7 is the best build tbh. lol, most of my work is in traditional medium, and lately has just been books upon books filled with anatomy studies. But I do enjoy painting (: