TAF is awesome, but don't get hung up on just one pin for your purchase; I remember I did the same thing, and took forever to decide which pin I would buy first, within a year I had bought 4 pins...Just pull the trigger on one to get you started, as you will undoubtedly buy more in the future.
I would recommend not paying retail, I made that mistake; first find a good pinball tech in your area; then buy local; best to ask around here and find some trustworthy pinsiders; 99% of them are great to do transactions with.
Best of luck