i can tell you right now , you will not get full fps in WoW or Sc2 in 1920x1080. your gonna lag because of the 5770. and everyone that knows how to build is going to tell you your getting ripped off... your paying for something that is worth 700 to build. Now, your processor can handle all the games your throw at it but that gpu will not be able too. For 1100 you aren't even getting a decent video card in that prebuilt.
Actually the cost is very close to a comparable rig built with name brand (not cheapest) parts at NewEgg. You are paying a small premium for someone else to build it for you. The HD 5770 will run your games at 1920x1200 with little problem. Good luck building this rig, with water cooling, Full ATX case and Windows 7 for $700.00 You could probably build a Dell XPS for around the same price and have a better warranty.