Need help with video card choice

[lunatecavangte]

Hi I am new to this forum and this will be my first post. I am not a hardcore PC person and don't know alot of information on where to look for information.

My question is this. I have 2 new HP Pavilion a1730n
Athlon 64 X2 4600+ Dual Core 2GB 320GB Computers running Vista Home Premium OS and I was wondering what video cards I should get to replace the onboard ones?

My budget is low about $100-130 per video card and I would like good reliable gaming cards that will be able to run Warhammer Online when it comes out.

Here are some of the specs on the computers:
PROCESSOR
Athlon 64 X2 (W) 4600+ 2.4 GHz
2000 MT/s (mega transfers/second)
MEMORY
Memory Installed 2 GB
Maximum allowed 4 GB* (4 x 1 GB)
*Actual available memory may be less
Speed supported PC2-4200 MB/sec
Type 240 pin, DDR2 SDRAM
VIDEO GRAPHICS
GeForce 6150 LE Integrated graphics
EXPANSION SLOTS
PCI Three (Two available)
PCI Express x16 One (One available)
OPERATING SYSTEM
Windows Vista Home Premium

[Xzin]

Buy nVidia. Geforce 7600GT or 8600 something.

[lunatecavangte]

Should I stick with 256 or 512 for either of those?