Heh...well and I don't mean this to sound sarcastic, but Linux has different branches of kernel release, stable, experimental etc.
So if you get a stable branch, then its a stable kernel!
As far as distro's go, I usually recommend Mandrake, but thats purely because I found it was the one that had a release for x86_64 before most of the others. If you feel comfortable compiling your own kernels, then really you could download almost any distro and replace the stock kernel with the one that you want.
For x86_64 I would recommend a 2.6 kernel (I'm currently running 2.6.3) since the performance is way
more responsive than I found the 2.4 kernels to be. Plus there are a huge number of patches/fixes/addons for x86_64 in there.
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