@skinzy
”Unfortunately, no one in this thread has responded to my question directly based on direct personal experience with an upgrade”
I’ve learned a lot of the various audio forums, but unlike most of my hobbies I have to say audio forums have than their share of people who just like to talk and more seriously unfriendly people. (Not talking about anyone on the thread; just a general comment.)
Back to your question, I would probably reach out to Wilson or your dealer and see what they think about different monoblocks. The 800D3s have a weird dip (or requirement or something; I have forgotten ) that the Deltas can specifically address. All speakers will have their quirks, no matter how nice. You might want to see if there is a particular set of monoblocks that cures that issue, whatever it is.
My gut tells me you’re not going to do much better than two Deltas, unless it’s four Deltas in a bi-amp set up.
(One other intriguing possibility would be the McIntosh hybrid drive amps. McIntosh gets a bad rap in audio forums due to being too “common” for a lot of folks — and overpriced in some models.)
But I’m intrigued by the Mcintosh mc451 dual mono amplifier, that has tubes on top and solid state below. From the ad copy “The MC451 Dual Mono Amplifier is a high-end, hybrid amplifier designed for bi-amping loudspeakers. It combines a 150 Watt vacuum tube amplifier and a 300 Watt solid-state amplifier on a single chassis, utilizing McIntosh’s proprietary Hybrid Drive technology.”
Note, I’ve never heard or even seen one of these. So it’s not recommendation, just spitballing.