I've found Conrad Johnson equipment works well with B&W speakers.
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Some of the high end NAD amps will sound great. I don't own one but have heard them.
BTW, if you've not purchased the 683, I can think of other speakers in that range you may want to listen to. For grins, listen to a pair of Paradigm Studios. I don't think the B&W will do well against them. There are many others also that you owe it to yourself to listen to.
You may be able to pick up a nice paid of used 703s here for the same price or not much more.