If you're used to running Knoppix, I would wager you'd have the easiest adoption of Kubuntu for installing. Knoppix is great as a live CD, but doesn't make a great install. It'll go on fine, but when you look to update or change something I've known several people to run into major problems. Ubuntu and Kubuntu are basically the same thing, just GNOME and KDE respectively. Knoppix runs KDE (by default) which is why I recommend Kubuntu.
<br><br>Both Fedora and SuSE are good, but I've noticed that the experience can flip flop a bit from release to release. One good, the next not so good. <br><br>-Gamble<br>