Cambridge 640, 740 and 840


I am looking to buy a new player and have heard a lot of good things about the Cambridge line but don't have a dealer in my area. Is anyone familiar with the 640, 740 and 840 players, does one really provide more bang for the buck over the other two?
phill
buy the 564D at a cheaper price - uses the same wolfson dac, potent bass but slightly lean overall tonally compared to the best. Very good value for money as it has a lot of the qualities found in the very best.