Need Help 4 my Graphics System

No matter when Vista ships I'm getting ready 4 it. Just wanna ask all of u if my configuration is a decent one. Here it is:>>

1. Intel D865GBF Motherboard
2. Intel Pentium 4 2.8GHz HT
3. Hynix 512MB 400Mhz DDR-RAM Module
4. Samsung 80GB HardDrive @ 7200rpm (running WinXP on D drive)
5. Sony DRU-710A Dual Layer DVD writer
6. A pathetic old Samsung CDRW drive

Q>> Should I need to buy a graphics card?

A>> If yes then which one. Plz give the entire details and the price. My budget can at the most be around 5K - 6K.