$550 Budget Gaming PC? HELP

Can someone put together a good list of parts for me? I know this might take a little but I'm looking for my budget to be Around $550 Or less, maybe $600 at the very most and if needed. At the moment I have a portable dinosaur. This thing runs DayZ like it's a rock. Even on all low, and with all these tips I've gathered I only get around 3-13 at the most FPS. So I am building a new PC. And this is where the MPGH community comes in. I really need help and I have no luck when it comes to good deals for performance. I've been researching this stuff for about 3 months and all my combos suck. I'm looking for specs like:

-Around 4GB of RAM or more
-At least 2.5 - 2.8+ GHz on the processor
-Around 1GB video card
-Not TOO power intensive
-Can play DayZ pretty well ( In Cherno/Elektro with atleast 20-25 FPS )
-Can play games like BF3 at atleast 40-45 FPS pretty good

I am looking for a decent gaming computer that fits together well and that I can upgrade in the future. Don't make this like it's permanent because I will upgrade things like RAM, Video Cards and Hard Drive Space/ HDD / SDD in the future. I am not very good at finding things like this. If you can, please look for deals on Amazon. If you think another site is better, please use that and tell me. I would really love help. BTW, I can deal with the monitor, mouse and keyboard. Thanks Y'all.

SOLVED: MY FREIND ROMNEY HELPED ME OUT: LOOK AT BOTTOM COMMENT. I LISTED ALL THE PARTS AND STUFF. W/ SHIPPING IT'S ABOUT $550