hello! im new here and im planning on building my gaming rig. i need comments for the this specs.

mobo : gigabyte z68x-ud3
processor : i7
gpu : radeon 5770
ram : 8gb

i'll change the gpu later i just want to start playing ASAP :)can it play starcraft 2, skyrim, nba 2k12 and gta4?
thanks in advance