First, congratulations on picking one up. WOZ is the real deal, and if you can look past all the noise and survive the wait, you are in for one of the best games available right now.
I love to mod my games. There is no better way to get to know a new machine than spending a bunch of time under the glass tinkering. While I agree with what others have said, that this game really doesn't need much in the add-on department, there are a lot of great finishing touches out there for you add some personal polish.
Here's what I've added to mine:
- Lolipop target decals for the rainbow targets (picked them up off someone on ebay, can't remember who)
- Mezelmods lighted winkie target (I went with green)
- Plastic protectors and Wizard shroud from Indypinhead (outstanding quality)
- Witch castle walls and emerald city from Back Alley Creations (expensive but oh well they look amazing)
- Lighting kit from Pinballbulbs.com (this is the only real 'must have'. The game really is too dark to appreciate all the detail, and if you have the game in a room that's not well lit then you will want this kit. I found the default set up to be too bright, so I've played around with the spot bulbs to tone it down a bit)
- superbands for the flipper rubbers (black and orange)
- candy apple shooter rod (number 4 I think, looks good)
Have fun