According to their blog [1] a lot of their templates use 960.gs, which might make them more friendly to use than ThemeForest.
Just to play devil's advocate, plenty of themes use 960 on ThemeForest. I think all of them have used jQuery, but I've definitely bought a couple using 960 :)
According to their blog [1] a lot of their templates use 960.gs, which might make them more friendly to use than ThemeForest.
[1] http://www.woothemes.com/2008/12/why-we-love-960gs/