i've had a few combinations of mirrors and bars. My stock mirrors on buckhorns had very low vibration. after those broke, i replaced them with cheapo plastic ones on harley sportster bars and they vibrated like crazy; so bad that the glass popped out of the one and broke. I got a decent secondhand set of solid metal mirrors on ebay for like $30 and they were much better. they came with 2 sets of stems, but i use the longer ones to see over my shoulders. I am now using those mirrors back on the stock bars and the vibration is about the same, maybe less.
of all the things that affect vibrations in the mirrors, the most important is the weight of the mirror itself. Stock ones have metal inserts behind the glass. mirror length makes some difference, they have less room to bounce around. bar weights make a big difference. stock buckhorns are weighted on the ends, harley bars are not and shook my hands around more, and therefore, the mirrors as well.
so long story short, savage buckhorns with stock mirrors work pretty well. if you want less vibration, solid mirrors on short stems.