Ubuntu to Kubuntu?

[Jason E. Dorfler]

To those in the know,

I dual boot.  Right now I am very happy with my set up.  However, I wish 
to try Kubuntu due to Mandriva using KDE being able to optimize my 
hardware better than Ubuntu can at this time.  I'm thinking it may have 
to do with KDE and not Mandriva itself.  If I install the Kubuntu 
package on my Ubuntu install, will I be able to change back easily to 
Ubuntu if it is not what I think it is?  If so, would it be wiser to use 
a spare hard drive I have laying around, install Ubuntu, then install 
the Kubuntu packages on top, or go ahead and download Kubuntu itself and 
  install that fresh on said spare hard drive?  Thank you ahead of time 
for your answers.

Jason
-- 
Jason E. Dorfler

MS WinXP Pro sp3         / Ubuntu 8.04.1
Thunderbird 2.0.0.16     / 2.0.0.16
Firefox 3.0              / 3.0
Open Office.org 2.4.1    / 2.4.1