Here's a tough one, the ultimate Bally/Williams VS Stern showdown.
Medieval Madness, Monster Bash, and Attack From Mars, VS
AC/DC premium, Avengers LE, and Steve Ritchie Star Trek (assuming it gets built).
The rules:
1. Assume all machines have equal value and that will not change. This question is for players, not speculators.
2. You have to keep either set of three games for three years.
Which three games would you choose?