HELP with gaming pc build

[canmaan]

my uncle is giving me his old gaming pc and i just want to know if there is anything that i can keep and not have to replace here are the specs
Case – 120$
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021

Power Supply – 80$
http://www.newegg.com/Product/Product.aspx?Item=N82E16817701004

Processor – 185$
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115018

CPU heatsink – 10$
http://www.newegg.com/Product/Product.aspx?Item=N82E16835150083


RAM – 80$
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231149


Motherboard – 175$ :
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128348

Hard Drive – 60$
http://www.newegg.com/Product/Product.aspx?Item=N82E16822148262

DVD/CD burner – 31$
http://www.newegg.com/Product/Product.aspx?Item=N82E16827129032

Video Card – 180$
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130317
he built this back in 2008, I am needing to replace this on a budget around 450-500 dollars any suggestions, thanks in advanced.

 

[daisymtc]

Keep case, DVD burner, HDD, PSU.

However, $500 budget is a bit low if CPU and Mobo need to be change.

May be you just upgrade to 120GB SSD ($110), + 2 x 4GB RAM ($60) + GTX 760 ($250)