Which gpu should i pickup

[adnan fx]

my specification:
cpu:amd athlonx2 7750
mobo:asus m3n78-am
ram:4g ddr2
psu: fsp saga+350 400w(max) 12v1=10a 12v2=13a

which gpu should i pickup

 

[megagabobe1]

how much you want to spend?

 

[avacadobread]

megagabobe1 has a point, what are you willing to spend?