You have a pretty wide range of stuff as it is! For theatre stuff would a good sturdy tripod (carbon fibre for carrying around when birding?) be useful. I would look at the 500 rather than the 400 f2.8 as price and weight are pretty much the same so why not go for the greater reach? You have 400 covered anyway and you can always stick a 1.4 converter on the 500 and extend it out to 700 with excellent quality and maintain autofocus. You also have no macro or flash equipment so that is another area to consider and would open up a whole new area of photography for you to explore. Just some thoughts.
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