well I think the various levels of JLPT are worth doing just for a sense of achievement and as an external official validation of the time and effort you've spent.
If you find JLPT impractical have a look at the test JETRO administers
http://www.jetro.go.jp/uk/japanese_language/
Business Japanese including 2 oral components. Tested in November in the UK. It strikes me as a very practical test. and also way beyond my abilities and interests. ( I find business stuff boring and incomprehensible in English. I doubt it being in Japanese would make it any better.)