Would like your tube amp recommendation

In short, the answer is yes. I was at a dealer hoping to audition the dialogue HP integrated. They didn't have it. But he didn't know much about Primaluna. So, he brought in the prologue premium and hooked it up to the Maggies. We listened for about an hour and frankly we were both quite impressed. It really sounded great, and did not seem like it was working hard at all.  

If if you step up the amplification to mono blocks, it would be even better. If you can afford it, consider the dialogue HP mono blocks. I listened to them recently and came away very impressed with those as well.  Even so, the prologue or dialogue monos will definitely drive those Maggies very well. 

 In the end I walked out after placing an order for the Dialogue Premium HP integrated. I think it will be a great step up from my current Dialogue One I'm using to run my B&W 803s.  I've been happy with the Dialogue for almost five years, so it's time to move up the chain. 

Good luck with your search!

Premium speakers require high octane power,suggest you check out Coincident Technology Dragon MK 2 mono blocks.The only thing between you and the music is air.

Have you seen this review of your speaker?

http://www.theabsolutesound.com/articles/magnepan-mg-201-loudspeaker/

The reviewer thinks they need 300w into 4 ohms to "come to life", and with a sensitivity of 85db/2.83v, which is 82db/1w because of the 4 ohm, I would agree. Some simple acoustic music would probably sound ok, but anything with dynamics would suffer.

A lot will depend on your room size and listening preferences, but the 20.1 was/is an excellent speaker, although I do agree it seems to need some power. But you can drive it quite successfully with less than 300 watts. Jim Winey used to make a point of telling me every time he saw me that the MG-20s he heard at Johnathon Valin's house sounded the best he had ever heard, driven by our MA-2s. I've also heard the MG20.7s driven by a pair of ARC  Ref 150s which worked great as well.

Whatever sensitivity/efficiency number the speaker has, add 6db to deal with the fact that its a line source and you will get a better idea of how easy it is to drive.