I've owned the 40's and have heard the Aleph 1.2 numerous times on separate occassions (not with the RM40's though). The Aleph is a warm sounding amp that would go well with the RM40's in my opinion. I've not heard the 2's. Depending on how loud you listen 100w might be just fine, though Classical is very dynamic the extra headroom of the 1.2 might be useful. Either way, these amps get HOT.
I had the X250 with my 40's and the combination was excellent.
Glenn