I'm only an amateur, but for me the C220 represented the best value. It's built as heavily as the C330, but has fewer 'features'. This may sound counter-intuitive, but fewer features is better for me because it means fewer potential problems. I wanted the quality of the C330s without the gadgets; I only use it for landscapes and portraits, so I don't need the speed of the C330. The C220 was considerably less expensive too.
Just my $0.02.