Need to know the best proccessor ...........

Almost any processor will mate well with the amp. The (old) 1570 lacks an EQ function but, if it sounds like the 1572 that I reviewed, it is a nice prepro. From the current crop, I would suggest you look at the Marantz 8801 which I have seen, at discount, under $3K or the Integra 80.3 which is even less.

trying to determine the best amplifier to connect to Krell S-1000, sound processor, tried my adcom GFA-7000, but didn't get the best out of the processor the speakers are B&W 683

Drew911, match the amps to your speakers. Any decent prepro will mate well with any decent amp.

I'm not an Adcom fan, and I particularly don't think they work well with B&W. Try something along the lines of Hafler, Bryston, B&K or Parasound.