I used to own a Big Deal, and it was a fun game for a Williams. Much like Space Mission - two of the better Williams EMs. Two Drop Target banks and the horsehoe makes this a really good title. I sold my restored game for $1300 8 years ago, and it has not had one single problem since I sold it.
In today's market - if you think $1000 is a "great buy" then grab it ! Personally, I think it is worth $900-$1000.