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Good advice above.
It's a very good lens, but not as good as the 105/2.5, or the earlier 85/1.8 non-AI. The drawback to the 85/1.8, though, is that it's pretty heavy and bulky, and bokeh when stopped down to f/4 or so is weird and polygonal. For a compact lens that you're likely to use stopped down, the 85/2 is great. For something used more often at wide stops, the 85/1.8 is better.
$200 is probably a reasonable, though not amazing, price.