papa new cd-rom drives the dvd with burners run 15-20.00 for new sata one on most web pages. 8g of ram run you 40.00 online from most stores for ram with lifetime warranty. I pick up an asus-v 77x mb there running 125.00 right now with rebate from micro center and new egg. I drop in a i5-3570 from micro center that 169.00. a good 750-800w ps will be 80.00
2g seagate drives from micro center are 100.00.
look into 660 or 7850. or hold off in-til april and pick up a haswell cpu and a new ati 8000 gpu. there not many games that bottle neck an i5 cpu today and a good mid to high end gpu.