Honestly if you like a taller sound stage the 3.4 - 5.4 and C2's will be very close to each other. That's my only complaint with any larger speaker. When you heard the 3.4LE and 5.4 were they a side by side comparison? If so which did you prefer and why? I'm very biased with Confidence and Evidence being (in my opinion) that they are the most balanced and natural sounding from top to bottom.I sit about 3 meters from sound source. So I think that 3.4 le will be perfect and more suit my room. Or c2 will be fine too?
Is there any way you can demo C2's? If not maybe compare a C1 to a 1.4. That way you would bet a better idea on the differences between Contour and Confidence sound quality.