The gpu isnt as good as the ti boost but since youll only be playing mmorpgs for now, theres no need for that. The core i3 is a great starting cpu and its better than some of the fx cpus amd has to offer. You get better upgradability here since you can get a core i5 or i7 later on. The 7770 will play most modern games on high-ultra on 720p amd mid to high on 1080p including crysis 3.
If you want maui67's build, youll get a phenom which is a good quad core and its overclockable and its cheaper but im not a big fan of phenoms so yeah. Its a good build though. Mine is just more of an all rounder build (video encoding, video editting, etc.) good luck!