Maybe trade the pre and power amp in for tubes? A tube integrated might work. I think you should take Rich's comments seriously. Make sure you are upgrading for a reason. B&K or Acurus have some amps in that price range that are somewhat musical. You might also investigate making the jump to a better $1k used integrated amp. The Krell 300i would be 'more forgiving' than you adcom stack, based on the adcom I've heard.
Aaron
Aaron