I'm not vouching for the validity of this site, but here's an interesting look into what the Tier 3 armor sets might look like http://www.malicesb.net/wapnew/tier-3.php. Please note that in an interview, it was stated that the EASIEST mob encounter in Naraxxamas is equivalent to the Twin Emperors battle of 40 man AQ. Those are the last two bosses before C'Thun btw. Also note that the SGA has not gotten past the second boss event in 20 man AQ. Good luck and enjoy.