I am pretty young, and I am on a budget and so far I can't get enough money to buy a new computer overall.
I have a emachine el1300g-02w, and I have games like Left 4 Dead 2, Portal 2, TF2, Garry's mod, Viva Pinata, Sims, and spore
Left 4 dead and portal 2 are VERY SLOW on my machine and it cause of my on board graphics card geforce 6150se! So I saw
a PCI-E 1x card (Since my pc is only compatible with 1x pci-e) it is the ZOTAC NVIDIA geforce GT 520 512mb DDR3 1x pci-e video card.
You might just want to save money and build a computer yourself. Although, you would be able to use the some parts from your old computer if you were going to build from scratch, like the hard drive and the disk drive.