Considering Imac

I've decided to retire my old 400mzh 128mb dual boot (linux, win98) machine
and am considering one of the new intel based imacs.

I've gotten to like KDE on my old machine.

It appears I can install KDE on the imac, but haven't been able to locate
much information.  Would like to know more before taking the plunge.  I'm
not sure what questions to ask at this point.

I've been a *nix user for many years, going back to the ATT unix PC, and
the Ridge 32 (!).

Thanks,

John Velman