Maximum PC

Been a while since I have posted here and I always get good advice. I am in the market for a new GPU for my build. I am running a Gigabyte P55 1156 board, i5-750 chip, 4gb G-Skill ram, 550 Cooler master PSU and a used xfx 5750 card. I run a 24" asus and a 20" acer LED for monitors. THe 24 is my gaming monitor. I do mostly gaming (WoW, D3, Skyrim) and watch dvds and videos online. Budget of under $250. I plan on upgrading the mobo, cpu and memory in the near future, hopefully before christmas. I usually get 4-5 yrs on a build.
Thank you all in advance.

You could get a HD 7850 if you want something now. Otherwise I'd wait a bit until NVIDIA's midrange video cards come out to weigh your options.