Best Linux Distro, For Personal Computer Use Options

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I've had Ubuntu and Fedora on two of my machines for a good 5 months now. Personally, I've become a huge, huge fan of Linux and I don't see myself switching back to Windows or crossing over to the dark side of Mac anytime soon (aside from government computers, of course).

Well, I just picked up Mandriva and it runs even smoother than the other distributions that I have. My mediocre Dell Insprion 6000 now operates like an XPS or Alienware computer, in terms of speed. After a few hours playing around on the terminal, I managed to install Fruity Loops 7 XXL Producer Edition as well as the racing game GRID. Everything runs smoothly.

Still, I can't seem to figure out which Linux distro is the best. Each one I've acquired has been better than the one before. For the Linux users, what distros are you running on your machines? What do you personally recommend?

edit: KDE is growing on me. I'm still partial to Gnome, but KDE 4.1 looks clean.

[fameONE]

^What exactly don't you like about it? I heard OpenSUSE based servers are extremely secure.

I just got my hands on Kubuntu 8.10 and damn, I'm really disappointed with KDE 4. It has all the bells and whistles that Vista has (desktop widgets, window effects, etc). The Kubuntu repositories are endless, which is a plus, but my desktop just kept crashing. When it didn't crash, the screen kept jumping. I even deleted the partition and re-installed the OS, but I got the same problem.