Go for contrast, definitely! Trying to match dark mahogany exactly with a new floor is almost impossible and usually ends up looking very heavy and dated. We have a dark walnut dresser that we wanted to feature, so we looked at the project gallery on
http://www.hoffparquet.co.uk/ for inspiration. We ended up ordering a beautiful, natural mid-toned European oak with a matte finish. The lighter, natural tones of the floor act like a neutral canvas, making the dark antique furniture absolutely pop without competing with it. Their sample service is excellent, so you can literally hold the wood blocks right against your furniture to see how the tones play together before buying.