All those look pretty good, dude. But you're forgetting the most important part of the build, which is the power supply. Try for a GOOD 500W PSU. Make sure it's by a reputable maker and that it gets good reviews.
Also remember that after you get the major components, you'll get nickel and dimed all way up way past your budget. It just happens. Do you have a monitor? Do you have a HDD? Do you have all your cables, keyboard, mouse, optical drive, wireless adapter? And don't forget about an OS!
Good luck! That setup will definitely run Skyrim and MW3 at medium settings.