Panais, I would go with the Geforce 9800GX2 also. It is faster than the ATI. Just make sure that your power supply is at least 580 watts and that it has two 6-pin PCI-E plugs for the graphics card.
System Requirements - 1GB of system memory
- CD or DVD-ROM driver
- 100MB of available hard disk drive space for basic driver installation
- Microsoft® Windows Vista™ or XP operating system
- PCI Express®-compliant system motherboard with one vacant PCI Express® x16 slot
- One vacant add-in card slot below the PCI Express® x16 slot. This graphics card physically occupies two slots
- 580W PCI Express®-compliant system power supply with a combined 12V current rating of 40A or more*
- One 8-pin and one 6-pin PCI Express® supplementary power connector -or- Two 6-pin PCI Express® supplementary power connectors
- NOTE: For the power requirements of two GeForce® 9800 GX2-based graphics cards in an NVIDIA SLI® configuration, please visit Your Page Title
Shawn