The question I would ask why only 5 however since this is a hypothetical Ill give it a go...
TZ
TAF
Volley (Yeah John I!)
ACDC Premium
oh this is tough... yeah got to go with BSD because I need to be humbled from time to time...
Fun question but quite frankly the 20+ machines I have are all my favorites didn't even scratch the surface of my 80's SS machines in the collection... honorable mention to Centaur, Mata Harri, BOP, and EBD!