Not so deep into the future we may have trouble finding brand new cheap Class AB power amplifiers. If anything, it might be wise to buy one now if that's what you might want down the road. Of course, a used Class AB might be available <$1000 but will the company/service manuals still be around and how soon will it need recapping and other service?
High End Amp Price Collapse musings
If Class D amplification becomes accepted by audiophiles there should be a glut of high end amps (Krell, Levinson, Pass etc) becoming available on the used market at prices a fraction of what they are now.
Think CRT TV when the flat panels began emerging.I think Ill hold off on a new/used amp purchase for a little while. Maybe I will bet a Boulder.
Has any one else considered this?