PC upgrade

[Richard]

Hai, I am planning on a PC upgrade.

OS: WinXP Professional 5.1 SP3 (Build #2600)
CPU: AMD Athlon 64 3200+, 2.00 GHz, 512KB
Video: ATI Radeon 9600/9550/X1050 Series (1280x1024x32bpp 60Hz)
Sound: Realtek AC97
Audio Memory: Used: 632/1024MB
Free: 2.81 GB/48.83 GB

(Note: generated with DarkEngine on IRC, so some things may be missing )

That's what I have right now. I know, far from great.

Now, what I would like to hear, what should I upgrade? What's the most important?

Please help me out as I don't know about this stuff myself.

Thanks in advance!