hi
i wanted to build a scrypt mining rig. but with just 1 graphics card as i dont want to invest much right now.

can you suggest me which is the best graphics card (for the price) available on amazon.com and how much hash power should i expect.
also, after i get the card, what all will i need to get the rig mining? will i be able to do it or will i have to go to some computer shop?

thanks a lot!