I'd say between $1,500 and $2,000.
I don't have quite as many words as rotuts to add, but amortize it over the course of espresso drinks.
Let's say you buy 1 drink a day at a real (i.e. not starbucks) 2nd or 3rd wave coffee shop.
And let say that drinks costs, conservatively, $3 .
Without figuring in the cost of the software, because I haven't done math in a long time (good beans probably run between $18 - $24/lb.) Pays off in less than a year and a half.