This may be the dumbest question I have asked, but what about the Kohout Enterprises (pinballpcb.com) MPU board.
Is there something wrong with this that I am unaware of?

I didn't think of that at all - I didn't know they made Williams CPU boards etc. I had bought their alphanumeric displays, and they are great. I asked Ken as I have dealt with him in the past and if he didn't have a board I was going to ask Beaky. I try to buy from the local guys. Williams boards are not really my thing. It it was a Bally, I'd be all over the repairs.

Mike - They do refund the postage sometimes. Last time I bought I thought the postage was steep and then I had a partial refund in my paypal account !