Rotel RB1080 vs Odyssey Stratos vs McCormack DNA

I recently purchased a used Rotel RB-1080, but I am not satisfy with it. It has a click sound occasionally due to expansion/contraction because I put it in a tight cabinet, although it doesn't affect my listening, but it bothers me. I am planning to get another amp around $800. I did some research and found 2 candidates - Odyssey Stratos and McCormack DNA-1. It seems both of them are in a different class. However, they also seems to be a lot older, the Rotel I have is 2 yrs old, while I found a 9 yrs old Odyssey for $800, and I believe the McCormack is even older. I believe the capacitors degrade over time, should I keep the newer Rotel, or go for the older Odyssey or McCormack? Which one would you pick?