Jeremy, of the models you list I've only heard the 407, and IMHO it's a great amp.
The new one 408 (it replaced the 407) it's more complex design in terms of topology.
The 530 is a class A amp, and uses Mosfet transistors, it should have a diferent sonority, as you say warmer.
One of the great things of Accuphase amp is that he plays all kinds of music, not only classical or jazz.
Power can be an issue, because of the music you listen, how you listen, the size of the room and your speakers, then you should consider the amp with the higher power rating.
Whatever your choice, you will be a very happy customer.
The new one 408 (it replaced the 407) it's more complex design in terms of topology.
The 530 is a class A amp, and uses Mosfet transistors, it should have a diferent sonority, as you say warmer.
One of the great things of Accuphase amp is that he plays all kinds of music, not only classical or jazz.
Power can be an issue, because of the music you listen, how you listen, the size of the room and your speakers, then you should consider the amp with the higher power rating.
Whatever your choice, you will be a very happy customer.