Stereo amp narrower than 18" for Martin Logans

I'm cutting out a lot of good options with the 18" width limitation but I really want to put my amp out of sight in my stereo cabinet. Currently I have the Krell KSA-150 (width a tube Audio Research pre-amp) which has been great although I haven't heard anything else. I noticed many McIntosh amps are 17" wide and wonder if they'd be a good option. I'm also looking for something similarly priced ($1500) that is usually listed on Audiogon so I can get going on it.

This will probably narrow it down pretty well -- any suggestions?