We have said over and over again that the mid-range GPU market is a mess - a great mess of fantastic performance and value. Today we are taking a look at a pair of new graphics cards from ASUS and Sapphire that fit snuggly into the sub-$150 field. The ASUS GeForce GTS 250 Dark Knight edition and Sapphire Radeon HD 4850 Vapor go up against the HD 4770 to see who comes out on top.