Need Help with Graphics cards!

Hello,

I was just wondering which of the following graphics cards would be better to just run World of Warcraft at max settings, as of now I lag during combat and just want it to go away. I bought this PC at bestbuy less than a year ago. I took the specs from an older forum post. Here are the specs:

Processor


* Type AMD Athlon X2 7750 / 2.7 GHz
* Multi-Core processor technology
Dual-Core
* 64-bit processor Yes
* Installed Qty 1
* Max processors supported 1

Cache Memory

* Type L2 cache
* Installed Size 1 MB

RAM

* Installed Size 6 GB
* Technology DDR2 SDRAM
* RAM form factor DIMM 240-pin



Graphics Controller

* Graphics Processor / Vendor ATI Radeon HD 3200 Shared video memory (UMA)
* Video Memory 512 MB
* Max Allocated RAM Size 512 MB


Expansion / Connectivity

1 ( 0 ) x Processor,
Memory - DIMM 240-pin,
1 ( 1 ) x PCI Express x1,
1 ( 1 ) x PCI Express x16,
2 ( 2 ) x PCI

So my question is which one would be best to run wow at max settings?

-XFX - ATI RADEON HD 4650 1GB DDR2 PCI Express Graphics Card or
-EVGA 512-P3-1240-LR GeForce GT 240 Video Card - 512MB DDR5, PCI-Express 2.0

Im recently getting into the whole gaming scene, I m a newbie so please go easy on me, any advice on what other graphics cards would be better than the ones listed above would be appreciated. I am on a budget of $80 USD. Thank you in advance.