A friend of mine is looking to build a very nice gaming system for the holidays. He is working with a 3k budget and wants the best of everything. He wants me to build the system for him, but before I give him a list of components I wanted to know which video system I should get for him. Should I get him a Crossfire system or an SLI system? From what I can gather, SLI has a few bugs right now (tearing, compatibility, ease of setup) and Crossfire has a better method of display. I don't know which to choose. Help me out.