My list is based on what I played back in the day when these games were brand new, and the memories they bring back from when I was a teenager:
In no particular order...
1. Eight Ball Deluxe
2. Xenon
3. Time Warp
4. Harlem Globetrotters
5. Bally Space Invaders (currently own)
6. Silverball Mania (currently own)
7. Gorgar
8. Black Knight
9. Dolly Parton
10. Flash
I could list another ten games from this period that also have fond memories for me.