Heres an example Ive built my pc for 160$ and here are the specs
PSU 550w
CPU fx 4100 quad core 3.6
GPU hd 6790 1 gb gddr5 256 bit
RAM 8 gb ddr3 1600 mhz
MOTHERBOARD AsRock 960 gm-gs3 am3+
MONITOR 20 inch ful hd
So you see it rly pays of to buy parts from local sellers cuz you can deal with them for rly low price