I have just installed win server2003 and am currently checking it out on my home network.
Firstly, 2003 comes with a high degree of built in security and if you also intend to use it for home use etc, you might find you need to do some tweaking.
Win 2000 is easier to use by far but how long MS will continue to support it is a different matter.
I struggled to find supported drivers for some older bits of kit with win 2k but 2003 installed and everything was up and running straight away with only one driver upgrade required which was instantly fixed with an online update.
As an aside, out of curiosity, I installed this on my oldest PC, a P3 450 with 128 meg Ram and a 6 Gig HDD just to see what the outcome would be.
Its running sweet as a nut up to now.
If you want to give it a go but relax some of the security features, have a read here.
http://win2k3.msfn.org/