I do not have any suggestions except, most large "centerpiece" fish will go thur the amano shrimp like a fat lady at the all you can eat buffet.
Agreed on both accounts, but to add something to the top layer of the water column I would go with either Marble / Silver Hachets or Nannostomus(pencilfishes) like these: http://animaldiversity.ummz.umich.edu/site/accounts/information/Nannostomus_trifasciatus.html.I would reconsider the SAEs. They eat a lot of food (much more than algae) when other fish are present, and can scare smaller fish and Amanos, even though they aren't really aggressive. They are so active they always scared my tetras.
A nice school of Rainbows can be a terrific centerpiece in themselves.
Sorry but Angels would go through the rummy nosed tets and shrimps like there's no end to the smorgasborg...Have you thought of an angelfish or 3?