I use 2 Ayre V-5's on my Vandersteen's. The Rogue's are great but even 1 V-5 would be a big step up.
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"The M-150s have a retail of $5K. So, I would be looking for something in the $6K to $10K MSRP range."
Why would that even matter? Spend more just for the sake of spending more? I won't tell you what to do, but I highly recommend picking a new amp based on sound quality and not price. If you don't, you'll fail.
Is there a reason besides logistics that you don't want to do the Rogue upgrade? I think that would be the most cost-effective way to go. That and replacing the power tubes with KT-120s, which will give you more extension both on top and bottom. But if you don't have a dealer to go through, I can see why it might not be an attractive option.
I'd also suggest trying different 12ax7s to get a midrange more to your liking.
Even though you mention that the move from the 150 to 180's does not really interest you, it may be a great option for you. That, along with some tube upgrades, would very likely bring you what you are looking for.
A pair of Rogue Apollos would most likely do the trick also.
Or, if you are really wanting a change in sound, then something like a pair of Cary 805's. These would certainly bring you the "fleshed out and intimate" mids.
***Cary and Rogue Dealer Disclaimer***
Maybe some nice solid state is the way to go. Everyone needs to go through the paces. I'm close to ready to ditch tubes. I know I might go back to tubes down the road but that's okay by me. I'm a firm believer in change and sometimes tube swapping doesn't satisfy the soul. It's expensive and tiring, especially if your intension is to enjoy music and not tweaking. It might take a little more due diligence, but it might be a nice break for you.
Sorry I can't give you any advice on gear. I'm in your boat and possibly sailing towards Hegel or even Marantz, although I've yet to hear the Marantz.
The last pair of amps I owned were Quicksilver Mini-Mite Monos. I sold them before the Vandersteens. They were good, with a very traditional tube sound. The mids were the strongest point. However the M-150 are much better.
I've been considering the following:
I'm not interesting in the 180 upgrade because shipping these things is a giant pain. I do not want to move them until they are being shipped to a new owner or going in as a trade at one of the local hifi shops.
I had a VT-100. Its very good but comes up short compared to a V-5. The ARC has a bit of an electronic sound to it in the upper frequencies. I didn't notice it with my ProAc's but you would definately hear it on the Vandersteen.
Also, someone else mentioned imaging and SS. I have now, and in the past, owned some very good ss and tube amps and nothing compares to the Ayre V-5 with imaging. The closest is my VAC 30/30. Its very good but as good as the Ayre.
Another poster mentioned Quicksilver. If you stay with tubes, you would have a tough time beating a pair of V-4's. I wouldn't hesitate to buy them for myself. The only problem is that they are big too.
After auditioning M-180s I settled on a pair of Carver 180s (230 watts). I didn't have the opportunity to compare them side by side. Even though there are a few things that seemed to stand out I don't trust my acoustical memory at all, sorry. I can say they do run much cooler.
The trick is finding a pair made by the original manufacturing team. They have gobs of power and come with a two ohm tape for your Maggies. They don't come with fancy casework but they look very well made on the inside.