I can't comment on the sonic qualities of the VP180 other than the fact its driver complement is to match the M80. Some advantages this will provide is better power handling, lower distortion and the ability to have better timbre matching to your M80 mains. The VP180 might also have superior off axis capabilities to the VP150.
The Denon 4310CI is a quality receiver and are known for their robust power supplies. According to this fine article published by Audioholics you should be OK running the M80 and VP180 set as "small" with your current receiver. Keep the unit well ventilated. For further reference, click on the link below.
http://www.audioholics.com/education/amplifier-technology/impedance-selector-switch-1
