Graphic Card Suggestion

Assalam-o-Alaikum,

Please suggest me a good graphic card. I need some thing like this :

64/128 bit

VRAM = 1gb or 512mb

I have a budget of 5k-7k

and a 300W PSU

My System Specs :

Dell Vostro A180

Intel core2duo E6400

2gb ddr2 x 1

hdd x 1

dvd x 1

no any other PCI card

and I think after having a low profile card like gt520, the total consumption would be 200-210 watt

correct me if I am wrong

Thank You,

M.Abdul Subhan