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Looking to upgrade my graphics card and power supply unit.

Current Specs

Seems like there isn't much room in the case though....http://imgur.com/a/Oxjac


Nothing too expensive. at most ~200$. I'm using a 21 inch monitor, I'd like to be able to play things at okay settings at 1920x1080.

Hmmm the 300watt PSU is the bottleneck here...

Best videocard (Asus Nvidia GTX 660) you could add, if the PSU can handle it: $230,-
Nvidia GTX 660: http://www.newegg.com/Product/Product.as...6814121660

Cheapest 500watt 80Plus certified PSU possible: $30,-
http://www.newegg.com/Product/Product.as...6817159124

Cheapest Corsair quality 430watt PSU possible: $45,-
http://www.newegg.com/Product/Product.as...6817139026

If that is too expensive for you atm, save some money and build a whole new PC when you have the money for it.