I am currently looking into upgrading my graphics capabilities. I currently have a HD3870 and I was wonder what your thoughts may be about upgrading. I was thinking of getting another HD3870 for crossfire since there like a 100 bucks now. Will I get a jump in performance that is worth it? I only play COD4 and now COD5 beta. I notice a little more jittering in COD5 so that's why I am looking to upgrade. Will a single 4870 be a better choice. Any other suggestions would be helpful. Thanks in advance.