Windows 2000 vs Windows XP

[Simon Campbell <simtrader@xxxxxxxxxx>]

I'm about to buy a new Pentium 4 machine for two main uses:

- trading/charting with TS4
- internet online order entry (& general web browsing)

...using a dual monitor Matrox G550 video card.

I don't care about the privacy/registration issue of Windows XP that has 
many in a furor.  I just care about stability, performance and 
compatibility.  What operating system would people in the know recommend I 
use for this machine?

Thanks in advance,
Simon.