Kubuntu LTS and KDE4

There are many Ubuntu variants around, including Linux Mint KDE Edition
(http://www.seopher.com/articles/review_of_linux_mint_bian...) -
so if you must upgrade soon, why not use a (K)ubuntu variant until Kubuntu catches up with a
stable KDE 4 version?  

It would be simpler and less hassle to just wait for an LTS version of Kubuntu.  Since Kubuntu
6.06 LTS is still supported on the desktop until June 2009, I don't think there's any rush to
upgrade.