If you are dollar conscious, I recommend you find a nice T-Amp for about $20-30. 10 watts per channel into 8 ohms. Sound quality is excellent. Believe me when I tell you that under normal conditions your M22s are being driven by less than 1/2 watt whatever amp you're using. You can either go through AA batteries or pick up a regulated power supply for another $25-30. Put the $350-400 you save into your Axiom sub fund.
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.