I first got into prog with the likes of Genesis and Yes, since then my archives have expanded to include
Threshold (current favourite)
Arena
IQ
Pendragon
Spock's Beard (with Neal Morse)
Transatlantic
Shadowland
Camel
Jadis
Land's End
Twelfth Night (with Geoff Mann)
Semi-prog:
Rush
Tool
A Perfect Circle
Kate Bush
All About Eve
Blackmore's Night
Iron Maiden
Demon
And for non-prog:
Rage Against The Machine
CSNZ (Brazilian band)
Cassia Eller (Brazilian rock chick)
Milton Nascimento (Brazilian bloke)
Tom Waits
Audioslave
The Cult
Paul Weller
Lou Reed
Santana
Propellerheads
Apollo 440
AC/DC
Aerosmith
There's quite a jump from Genesis/Yes ( I take it you mean the '70s incarnations) to Threshold. And about 20 years - what happened in between?
Currently listening to Masquerade Overture on headphones - I still reckon this is the finest album I've ever heard. It's on par to Selling England By The Pound. Magnificent.