Need advice on a gpu and ram to complete my build

parts list

cpu-fx 4300 

mobo-asus m5a78l -m lx plus

psu-corsair builder cx 500watt

hdd-1tb wd blue 3.5 inch 7200rpm



hey guys

i'm looking for a good gpu to complete my build i also need some ram but first thing first gpu . whats the best gpu for this build. parts must be on amazon please not newegg  

ram to match the motherboard >link<

gpu - gtx760 >link< or a 7870, 270x.

if you grab something from amazon rememeber to add the tek syndicate code.

It would also be nice if you had a budget also have you already bought the other parts or those are what you are looking at?

Ya what is the budget?