Hire Steven Wilson for the job
Please no, over hyped and vastly overrated, and this is coming from a Porcupine Tree fan.
I can't agree. Steven has consistently shown an appreciation for the original "vibe" and meticulous attention to detail in his 5.1 mixes. When he makes the decision to alter the original mix, I've agreed with the result 95% of the time. Most of the time, it's simply a matter of bringing out something that has been missed or buried for years. With classic prog, this can be revelatory, as so much of it is heavily layered, and there's only so much space across a single X-dimension.
By contrast, I had the first two Genesis 5.1 boxes, and found a number of the changes distracting. That quiet keyboard line which was so effective is now punched up to full volume and has lost all subtlety. The layers of acoustic instruments were at different volumes for a reason; having them all equally balanced is not necessarily better. Yes, we now hear parts that we didn't hear before, but you don't just push everything to 10 and call it a remix. I sold both boxes on eBay and haven't really worried about it.
I just got Steven's
Close to the Edge by Yes and I think he's done an excellent job. His work on King Crimson's
Red and ELP's first two albums is also excellent. I consider them improvements over the originals, but completely in keeping with the original vibes.
I'm not sure what you would have against Steven doing Pink Floyd's back catalogue. He's shown a great deal of care for the original work and no need to put his "personal mark" on it. That's exactly what is needed for this type of thing, not Nick Davis' "I'll tweak everything" attitude that he showed with Genesis.