New amp for Vandersteen 2CE

Once owned a pair of 2CE's and should have kept them. I had the beige socks which looked nice... also had the Sound Anchor stands which are a must. All the amps you mentioned are good amps and I've heard them all except the Odyssey. I wouldn't spend the money to upgrade your 565's; no doubt the Musical Concept mods will improve them... they're good mods. The fact as you mentioned you don't need the power and as you describe them is accurate with the Adcom amps. Adcom's were great bang for the buck and yes Musical Concept or Design mods were very popular back then. 

I I haven't heard the odyssey amps but they get great press and a lot of people hear throw them out so hopefully they really own them or have spent time listening to them.

Between Adcom, McCormack DNA 0.5 and the Pass A5 it's definitely the Pass with you speakers and what you are looking for. If the DNA 0.5 was a Deluxe I'd still go for the Pass. If you needed the more flexible amp and was set on the DNA 0.5 look for a Deluxe as it is a much better amp than the standard one. 

The Pass Aleph 5 is a very nice amp and on many speakers it's not the ideal amp but it will work nicely on your Vandies. It is a little toaster as you probably already know. If you don't like it, it will be an easy sell.

You started with the Pass Aleph 5 so guessing you know of one that's in your price point. I'd go for the Pass; it's a great amp and it will not be outclassed by your Vandy's which are nice speakers. I know both products having owned the 2CE's and listened to the Aleph 3 and 5 at the dealer when they were current pieces. The Aleph 5 will run no hotter than a tube amp but it is hot to the touch; just don't touch it when it's running. If you're in a real, real small room in the desert it might cook you out but I doubt it. The Aleph 5 will drive your speakers no problem. If you don't like the Aleph 5 you will not have a problem reselling it I as they don't last long on the market.