So many great places in the Denver area...
1up
Flipper McGill's-Idaho Springs-definitely worth the trip even if you're not planning on being near.
Lyons Classic Pinball-Lyons
Pinball Jones-Fort Collins
and, lots of great personal collections. If you know a collector in the area, let them know you're coming. You'd be surprised how open pinball collectors are to others with the same disease.
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Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com