imo just upgrade cpu.. way cheaper.. and if you still arent happy in the difference, just wait it out till the fall when the "zen" is released..
the 8320/8350 should be a nice upgrade from your 6200, and if you overclock; and your case permits it.. the corsair h100i gt/gtx, or the h110i gtx are prime options ( i use the h100i gt on my 8320, max temps so far havnt gone over 40*c)
up to you in the end result really.. spend a couple hundred for a upgrade to get you by for now, or spend a thousand for a new setup?