I ordered both. Will return one. Which one should I keep? I dont care for the colors at least not enough to give 11$ for it. Also I never go highter than 4000DPI so the 10.000DPI sensor doesnt make a difference for me in terms of DPI however if the new sensor is inother ways better than the old one I'd like to know about it. Other than that; is there any model specific issues that may prompt me to favor one over the other? Thanks.