I plan on giving Ubuntu a try eventually too...
It's a terrific distro. After trying a number of them, both rpm and deb,
I settled on Ubuntu (actually Kubuntu because I prefer KDE over Gnome),
and have stuck with it. It's on a somewhat rigid development schedule,
with new versions planned for release every six months or so. This is
both good and bad. Good because you are assured that each new release
has been thoroughly tested. Bad because there is sometimes a lag in
updating apps which may introduce new versions in the interim. Take
Firefox for example. If Mozilla releases a new version of Firefox due to
security issues, Ubuntu will put out a patched version of FF almost
immediately. However, if new versions of FF are just because of feature
upgrades, then Ubuntu will most likely wait until the new version of
Ubuntu is released and include the latest FF at that time. Fortunately,
there is an active Ubuntu backports repository which updates apps more
frequently. You could always install the latest version of an app from
the deb repositories, but the recommended method is to wait until a
version specifically compiled for Ubuntu is available in the Ubuntu
repositories. That being said, I have installed deb packages, and even
tarballs, with no ill effects (so far) when the program in which I am
interested is not available in an Ubuntu version. If you are interested
in installing (K)Ubuntu, these two excellent web sites should be your
bible:
Unofficial Ubuntu 5.04 Starter Guide
http://ubuntuguide.org/
KUDOS Unofficial Kubuntu FAQ
http://kudos.berlios.de/kf/
The Ubuntu forums are also very active and extremely informative:
http://www.ubuntuforums.org/
(And, of course, you might already be aware of all of the above).