Wow that is nice. I know the conversion ones don't fetch too much but I have always loved the dedicated. I actually like this game, got one in a Ms. Pac a while back, can't wait to play it again, monitor issues. I used to keep one of the boards on my test bench years back and when I had free time or just needed a quick fix I would hook it up and play a few games.
To your question, obviously I would try to get it as cheap as possible but wouldn't hesitate to offer $300 to start. Wouldn't be suprised to see $5-600, maybe more depending on the day and the buyer.
Before everyone starts calling me nuts remember, it is a dedicated original, yes conversions of this game are a dime a dozen but look how nice this cab looks.