There are two out of many that come to mind. I was using a Mac MC300 amp happily until I read many positive professional as well as user reviews of the Pass Labs x250.5 amp. I got one and hated everything about it.
Conversely, by chance I read an old review of Klipsch Epic CF 4 speakers on Audio Review.com, and then found a set used for $1k. I loved them for 15 years even after trying several others during that period, including the JBL Array 1400's.