Okay, so i the prices are really so high there so look for something like this build.
CPU : Athlon II x4 750K
Motheboard : Any cheap FM2 board with A75 or A85 chipset should be just fine.
RAM : Look for 2 x 4GB RAM. Even the 1333 Mhz would do because for gaming RAM does not matter. Going from 1333 to 1600Mhz yeild only like 2 FPS improvement which is negligible. I have sources that say the same, from Anandtech.
GPU : Go for the AMD 7870 or the Nvidia 660, whatever is cheaper there. Also look for AMD R9-270 if it is available and go for whatever is cheaper. The 550W should be fine for this build.
HDD : Grab any 1TB HDD, Seagate barracuda or WD Caviar Blue are good and cheap ones.
PSU : Tell us what PSU's are available in your budget and leave it for us to decide. It is important piece of hardware that you don't want to get wrong.
Case : Get any cheap case that suits you. Use the left money from budget prefferably otherwise you would spend like 100 bucks on it alone.
So, this should be a good enough build around 550 dollars.
Hence follow these guidelines and choose the parts that you feel are within your budget and tell us what you are going for, then we will give our thoughts on that.
I hope this helps.