Nothing on the original post list is a 20 year amp. And the $5,000 budget is a serious constraint. I can imagine a pair of Audiopax 88 monoblocks being satisfying for 20 years, but they are $15,000/pair.
However, there is one choice at $5,000 -- a used pair of McIntosh MC501 monoblocks. A new MC402 stereo amp would be just behind them. Not only will these amps actually last 20 years, but they'll power anything you'll buy in associated speakers and sound sensational doing it.
Phil
However, there is one choice at $5,000 -- a used pair of McIntosh MC501 monoblocks. A new MC402 stereo amp would be just behind them. Not only will these amps actually last 20 years, but they'll power anything you'll buy in associated speakers and sound sensational doing it.
Phil