I would just use a good solid state amp, or a good hybrid amp.
I heard the C4 on Naims amps at the 2002 stereophile show in NY and the speakers sounded amazing.
I posted it about it on here after the show happened.
Also read 06-03-02: asilver8@yahoo.com review of the Dynaudio C4 speakers.
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1023078723&openflup&14&4