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I looked at some of your recent posts and something seems to be getting to you about your current set-up. Have you been able to quantify that there is something missing from your system's sound or are you just torturing yourself thinking that there must be something that you can upgrade (like so many of us here)? Your set-up really seems OK (Adcom pre & power; Onkyo/PS Audio transport/DAC; Monitor Audio speakers) and I don't think that $350 will provide you with the "heads & shoulders" next level type of upgrade.
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.
Your amp and preamp are fine IMO. You'd have to spend a lot more change to do significantly better. I'd stick with copper wire only and look into getting another speaker. I think the Monitor speaker is decent, but I'd recommend looking into a nice British monitor like the Epos 12 or 14. They are quite smooth and can be found for a good price on this site. That change alone my offer you a more musical and less analytical result.