$500 Build Help?

Im looking to build a PC since my laptop finally died and need something to finally get back in the game. Im looking for something that basically plays G-Mod, BF3, Skyrim, Day Z, and most decent games at a good speed and graphics setting. I dont need a Mechanical Drive or a CD drive. any ideas willl be greatly apreciated! thank you in advance

i can stretch it to around $600 or a little more if i have to