the time has finally come for me to build a new gaming computer and i have come across a problem; i am stupid when it comes to graphics cards. i know enough to know what is powerful, but i have troubles with SLI/Crossfire. for my new rig, i have been looking at the GTX 550 Ti 2GB card from EVGA, which is fairly cheap, so i kinda want to get two, but i also have been looking at the GTX 570 2GB, also from EVGA, which is about twice the cost. i am stuck on which would perform better, the two 550s or the single 570, and since both setups would cost about the same, i am unconcerned about price and i am solely looking for better performance. anyone got any ideas? before anyone asks, yes, the new Mobo and PSU i have picked out will support the two 550s, and my case is big enough to fit them.