I'm far from an expert, but my vote is going to be a Gottlieb that's heavy in drop targets.
Atlantis (beautiful artwork, and a wedgehead)
Target Alpha/Solar City/El Dorado
I'm sure others can give more examples. The above are also good in that they're relatively abundant and have lots of parts/expertise availability.
For my money, Gottlieb was just "where it was" in the EM days. Says they guy who's owned two EM Ballys but never a Gottlieb.
Brad