Can someone tell me the best nvidia card i can install for gaming for an hp pavilion a430n, Motherboard ASUS A7N8X-LA, AMD Athlon(B) XP 3200+ running at 2.20 GHz, PC2700 DDR SDRAM DIMMs-512 right now upgrading to 2g, AGP8X slot, os xp sp3. will upgrade power supply as needed. first goal is to achieve pixel shader 2.0 or higher. thank you for any help