I was in your spot 2 years ago. I think you should buy a nib that you have played and enjoyed. I bought a Gotg nib and it was great purchase and it is has been error free since the day. I have now added a jp2 and just bought my first used machine after a couple of years. The one mistake that I did make was not asking around more about who to order it from. Marshall at little shop of games is great and so is will from old town pinball.