It isn't hard to find a 1080p-able graphics card, one of the Chrome cards might be the best idea if your using it with a tv because the $70 ones have display port and hdmi I think.
I guess you can run the movies from GPU, but my experience is that its very difficult to run all the format out there.
Plus the GPU acceleration seem a little bit buggy at the moment.
Why cant i press just play from WM player and enjoy full GPU acceleration? its always pain, I hate codecs.
I think is probably easier just to get a powerfull CPU and forget about this 'GPU codec nonsense'. Many Thanks anyway for your answer
BTW here is a great guide for accelerating of movies on the GPU:Guru3d accelerate x264 1080p movies guide