Personally, I feel that the SCM11's need much more current than the average amp can provide. The AS500 will drive them, but you're looking at amps like their own SIA2-150 in order to allow them to perform nearer to their norm, and to produce the sort of dynamics tenure actually capable of. At minimum, you're looking at Naim Nait XS, although the new Audiolab 8200a actually does a pretty good job - it will be interesting to try the new 8200 pre/power.
I would look at something a little more efficient - higher efficiency speakers tend to sound a little more lively, and lively speakers tend to sound better for lower level listening. Try KEF's Q300, or if you don't mind floorstanders, try the Q500 or Q700. I know it might sound like I'm over-hyping this new Q series, but I'm really struggling to find alternatives for certain scenarios. I'll be testing out the AS500 thoroughly next week to see which speakers it suits, and where it's limits lie regarding how good a speaker they can cope with. I would strongly recommend the KEF's. WHF will have a review of the Q300's in the next issue (I believe), so it'll be interesting to see what they have to say.