Well, I've been a Mandrake user since 7.0 and I've had my ups and downs with them. I'm running 10.0 Community right now and I really like it. If I hadn't liked it, I would have switched to Knoppix or Fedora by now. You CAN install Knoppix on to the HD, there is an ever evolving script that helps you through the process. I've got a friend who's been using Knoppix for about 2 years now, he's in love with the thing. Knoppix also has a lot of community surrounding it (
www.knoppix.new) which is a real plus. It's also "free as in speach and free as in beer" which is also good (but there are places to donate money to continue development, which is a good thing to do).
I wouldn't use knoppix right off the bat though. You're better off with Xandros or Mandrake. You can still download Mandrake for free, and their package manager (urpmi) is right up there with "apt" (which is a thing of beauty). If you want to get a boxed set, I'd purchase Xandros though; it's utilities are highly rated AND last time I checked their boxed set comes with crossOver Office, which can run BW! (at least 3.0 can, which is what I'm going to purchase this week).
On the other hand, Mandrake is pretty dang good, has a better community then Xandros, and mandrakeclub is actually a pretty valuable thing (I pay $120 a year for a silver membership, I've been happy). Mandrake also runs cxoffice 3.0 just fine, which is how I'm currently running BW (flawlessly, I might add; EVERYTHING works).