Pretty sure it would not be profitable. If you look at the difficulty chart here:
http://bitcoindifficulty.com/ it shows that in February the difficulty started skyrocketing (this was the time ASIC miners started shipping) an ASIC miner is 300x faster than a GPU. Once more and more ASIC miners are shipped and come online GPU mining will be worthless just as CPU mining was worthless once everyone started GPU mining.