The best power conditioner for less than $1K?

Before going to the expense of buying another PLC, you might consider changing your outlets. Hubbells and Pass & Seymour tend to be very revealing outlets, especially if cryo'ed. Furutech outlets might work, although they tend to be more dull than I prefer. A good median might be the FIM 880. They're out of production, but you can get them from Galen Carol audio.
If you do decide to go with another PLC, I highly recommend going with a 'parallel' conditioner setup in your price range. My ears tell me that 'tuning' your gear with 2 or 3 different 'parallel' filters upstream of your gear can do remarkable things to clean your sound without restricting dynamics. Blue Circle, AudioPrism, PS audio, Quantum, make good 'parallel' conditioners.

"I think the SS rotel and denon going into the revealing Proac's via the silver cables is the issue."

I'm with Dan on this one. I never did like an all solid state configuration ahead of my ProAcs. While the bass was tawt, the treble was bright and the midrange recessed. Just inserting a tube preamp changed everything for the better and in the direction I think you're looking for Sempaul.

Power conditioning can be of great help, and it seems like you've already done a lot in this area, but maybe a tube preamp with HT bypass might be the ticket here.

Remove the Monster I had a 2600 which was actually better for 2 channel cause it had less filtering than your monster, but it still was restricted slightly in the lower mids and bass causing it to be a bit less organic sounding, Go for a Power Link By ensemble, or possibly the one I think made by Blue circle now, these Are straight Copper buss bar design, no power switch and high quality outlets and dead silent shielded isolation type design, but they do nothing special just show you what your equipment sounds like.

I bought a year old BPT 3.5 Signature for $1300. I know I asked for recommendations for less than 1K. I'll let you all know my impressions after I've had a chance to run in my system for awhile.

Has anyone tried the Gutwire PLC? It's well under $1000.