Hello again
As i said before, with the B&W 684's, they need a good powerful amp that will drive them well but also with your taste in music, you dont want an amp thats too farward so i'd still say go for either an Arcam Alpha 9 or 10 integrated amp and look to add the matching power amp at a later date if you cant afford them both together in one purchase.
I would also consider the NAD C352 amp as well, it would suit the speakers very well but not sure about it going well with Rock and Classical music.
The Arcam Alpha amps are smooth and controlled but still with plent of power and great bass, well timed midrange and crisp, clean treble.