Miraga M1 vs Totem Mani-2

50 watts is 50 watts.  The fact that an amp is Class A or SET dosn't make it more powerful.  As I said before, IMO its not enough power.  Sure you can play them with 50 watts and they can sound ok, but you'll never hear what the speakers are capable of. I tried them with several amps when I owned them and found that I needed 200 watts before they would open up.  Same size room as yours too.

I know that Mani-2 are power hungry ( and M1 too ) 

But for my taste , Mirage played with Kronzilla much better than  with

Yamaha mx-1 ( 200watt 8ohm ) + First Sound Presence 4.0 Paramount ( tube preamp ) and better than Jolida Fusion 211 monoblocks ( 200watt from tubes in Push-Pull mode ) + FS preamp 

Maybe Kronzilla has only 50 watt , but monster power supply , 

Of course I know that Mani-2 are really difficult load , but I love Sound of tubes , especially SET and dont want to resign from this 

If you must have tubes and Mani's high pass the Mani's with a sub as I also mentioned.  Not as good as a higher powered amp imo but will work.  I actually tried this for a while too until I happened to hear how the Mani's could sound with proper power.  Who knows your mileage may vary but I doubt it :-)