Keeper => LOTR
It was the first pin I bought and has stood as my favorite pin of all time ever since. Barring financial calamity it will never leave. It integrates theme with gameplay better than any other pin I've ever encountered.
Overrated => IJ (W)
The only pin I've ever gotten rid of. Don't get me wrong. It is a good machine. Just not top 5/10 good. I'm much happier having SM take it's place.