Accuphase p-650

If somebody have the opportunity to hear/compare with another models from accuphase the final amplifier P-650,and can say anything about this amplifier please help me with some words.With what preamplifier is better to use c265,c275v.c290,c290V,and if is big diference in the sound between p-650 and the new line p7000,p7100.Is much better lyke old p-550 or p-450?
If can anybody tell me please if the sound will go on the same direction lyke with the integrated Accuphase E-406v,E-407.....
Thanks!