Depending on your resolution, the HD4770 is the best bang for your buck now. It's performance matches up to the pricier HD4850.
Whatever the case, even if you're gaming at a high resolution eg. 1920x1200, the HD4770 should have no problem handling Demigod assuming your CPU is also decent and you have >2GB RAM.
So yes, the HD4770 has a huge potential in it for it's measly price. Awesome card. Nvidia and it's fanboys have been put to shame thanks to this card.