My first choice would be an M10 while you can still get them.
Next I'd go for the smaller Tascams - they all have a 1/8" in: DR-05, 40, 100, 22WL, 44WL.
If you need smaller than that, maybe you're into the realm of "voice recorders" from Sony or Olympus, but I don't know if any of them do 24bit or if they have external inputs.
Nice timely avatar switch. I'll always associate you with "Young Bernie" though.