I'm not sure...
Debian Woody is stable and it's best suited for servers and so on.
But there's Unstable that will give you a lot of new things to play with.
Updates on unstable can be up to 30 megs in 24 hours..
I use Debian Stable right now , but i've modifeid my sourcelist so that i get a lot of unstable things and backports..
www.apt-get.org is a nice place too look for packages..