Seeing the key words "Warmer" and "Depth" The thought that comes to mind is M50. The key word for M50 is "Pleasant"
It also comes with the 30 day in-home trial, and unless I'm mistaken, if you don't like it and wish to trade-up, you can send it back with free shipping upon purchase of M60 or M80.
The M50 may be more relaxed or laid-back than the M22, but it still has a strong family resemblance to the rest of the Axiom line, so it will mate up quite well with the rest of your speakers. And the price is right: $630 USD thru Factory outlet.
At any rate, for music it would certainly be warmer than your M22s, and if you prefer your music without a sub, as many do, then the M50s will surely add depth in that area as well.
Just a thought.
Rich.
