I don't even know what a KVM switch does...
What I do know, is that my Mac needs no drivers for most devices. They are intuitively found by the OS, and placed where they need to be.
I wouldn't let a $29 keyboard, and $10 mouse stop me from enjoying good technology. Besides, it will be a chance to try the integration yourself. Someone has already done it, I would bet... and if you do a search, can find a way!
If I were buying today, it would be a $1300 G5 iMac... or spend the extra to write DVD's and view a 20"! I have a G5 desktop, with a almost new 30" display. You gotta see it, to love it! I carry a 17" G4 PowerBook on the road...
I wound up getting a x86. Wanted the mac, and will get one some day, but I needed the box for work and didn't want to take a chance on the mac not being a good choice for java/web services development. I also read that the mini mac has a striped down version of OSX and I that is what did it for me. I would have needed a full blown Unix OS as fall back if KVM hardware did not work or was too costly.