In my personal opinion:
Beijing Opera; Acrobatic show; Tang Dynasty show at Xian; Impression at Yangshuo

They are all famous shows in fact and show different aspects of Chinese Culture. It is not resonable to number them in terms of priority. You should choose according to your own interests. Most foreigners will not get use to the loud of Beijing Opera, but they can see how the actors make up and be interested in the way they performance and their costumes as well. Tang Dynasty Show is showing the old dance popular in Tang Dynasty. Impression of yangshuo will shows you how the ethnic minorities there live. I prefer these three shows if you will visit these three places.