Both are nice, the 2500K is a bear at OCing, I run mine at 4.8 24/7, the 7850 is a nice GPU and can OC moderately, have used a number of the Asus 7850s
Both are nice, the 2500K is a bear at OCing, I run mine at 4.8 24/7, the 7850 is a nice GPU and can OC moderately, have used a number of the Asus 7850s