Its OK most of the parts are good name parts exept the power supply sigma I would like to see something from Antec or Seasonic in there.. The video card you picked the 5770 I personally would go with the GTX 460 best bang for your buck card out right now.
$750 for that and a 3yr warranty isn't that bad. Its also not bad that your getting speakers and three games with it. It will end up costing you $850 once you get windows, less if your a student. I'm sure all of us here could build something similar for less, but I'm not sure all of us would want to provide support for the next 3yrs.
Anyone have info on that PSU? What resolution will that 5770 be powering?