Could you help me with advice?
I bought the following PC.
 
http://www.buy.com/retail/product. [...] 27&loc=101
 
Now I want to add a GeForce GTX card
 
http://www.newegg.com/Product/Prod [...] 6814143080
 
I do realize that I will need a larger power supply than the 250 W my new PC comes with.
It says 475 W in the spec for the graphic card. When I research power supplies it gives me  
models starting on from 19.95 Dollars with 480 W already for that price.
 
http://deals2buy.pgpartner.com/sea [...] ort/popup1[]=170:616/sortby=priceA
 
How do I know which ones will work fine with my computer for the lowest price? When you look  
at the graphic card link they recommend one with 800 W but it cost over 100 Dollar extra.
 
Would really appreciate your advise.

http://www.newegg.com/Product/Prod [...] _-17371004
 
this psu will do just fine for ur pc.. try looking somewhere else if u have a good deal(like rebate or off) around for this one..brand 500watt is enough for ur pc (like antec, seasonic, corsair)