100 is the best if your looking for a decent compromise of power and performance, torque limit as standard isnt great though, a remap completely transforms them! mine was brilliant! they are still holding mega money though!
80's are popping up cheap these days making a good buy, take one over a 65 if you can find one!, 65s arent a bad choice though especially if your not planning on remapping, if you are then it has to be at least an 80 for the better injectors.
matter of preference, gearbox and linkage setup on the dci65 and 80 is rubbish (as it is on the 1.2, 1.4 and 1.6 petrols) and the same as the 172/182 one although they get the benefit of the extra mount.
100 box is nice to use and hydraulic clutch is 10x better especially when commuting! so light!