Hi whart,
I had a Furman IT-Reference 20i a few years back and it is an impressively built component. I don't doubt a Furman's efficacy as a surge protector, so one of those could meet the OP's primary goal of protection, but IMO it's not likely the Furman model that sells for ~$500 (even used) will handle the current requirements of his amp.
On the 'not so much' side, the top of the line Furman I owned did little to improve sound quality compared to other brands I have since owned and heard in familiar environments. It did a great job of improving the picture quality of my projector-based HT system, but sound quality in my 2-channel system, not so much. FWIW.
Dave