Knowing you are running the W22's I think I am less likely to recommend a new amp for you. I did hear a different sound when I hooked up my M22's while using the A1400 but it wasn't as much of a difference, the highs did sound better and more spatial but to me it wasn't worth the upgrade, now for the M80s I can't wait to buy my seperate amp. Maybe spend your money on a second subwoofer ;\) \:\)

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70