I'd actually suggest updating to Etch (Testing) for a desktop box. X.org blows XFree86 out of the water.
Just edit your /etc/apt/sources.list, do a quick s/sarge/etch/, apt-get update && apt-get dist-upgrade, and it'll update you fairly painlessly. (Try doing that sort of thing with a lot of other distros and you'd be stuck; one of the main reasons Debian rocks in server space.)
Re: I've embarked on a radical downgrade of my software to... Red Hat 8.0.
Just edit your /etc/apt/sources.list, do a quick s/sarge/etch/, apt-get update && apt-get dist-upgrade, and it'll update you fairly painlessly. (Try doing that sort of thing with a lot of other distros and you'd be stuck; one of the main reasons Debian rocks in server space.)