i have a 20" monitor with 1680 X 1050 resolution. i was planning on getting the HD4850 because of its bang for its buck price. but ive decided that i can spend more money on the video card. and ive been reading about the HD4870, but i dont know if fit will really be an improvement on my resolution. which one should i pick? also, at this resolution, would the upcoming HD4870 x2 be any better?