1. Pink Floyd - Animals
This was probably the first album I ever became truly addicted to. Every day I'd put it on and listen to it repeatedly, especially "Dogs" which is still one of my all time favorite songs to date. When I'd go to bed I'd put it on and wake up with some random track playing off the album. Even five years after first hearing it I can still enjoy this album thoroughly through and through.
2. Rush - The Spirit of Radio (Greatest Hits 1974-1987)
When my dad first bought this for me back in 2006 I liked about half the tracks, but it wasn't anything I paid much attention to. About six or seven months later I dug it out of a dresser drawer and gave it a listen again. From that point on I knew Rush was going to be one of my favorites. Every song captivated me in some way that I can't explain. The Canadian trio has remained, and will remain, my favorite artists of all time.
3. Blue Öyster Cult - Secret Treaties
I actually bought this on a whim. I had a best of for BÖC and was looking to get into studio albums. I browsed around some forums and kept seeing that Secret Treaties was being hailed as the best album. So I went to my local store and bought it. From start to finish, this instantly became a classic for me. I couldn't find a single thing wrong with this album, and even to this day can't find a flaw.
4. David Gilmour - On An Island
I have always been a David Gilmour fan. Even when I didn't know about his solo career I obsessed over his guitar work and vocals with Pink Floyd. When I heard about the Remember That Night concert was going to be played in theaters, I knew I had to go. As soon as I left the concert presentation I went out and bought this album. A few months later I picked up guitar like I had always wanted to do because of him.
5. King Crimson - Islands
I had heard of King Crimson for a while but had never looked into them. While I really enjoyed every single album for its own creativeness that came from the band at the time, this album has always intrigued me most. I'm not sure why really, but I typically come back to this one album every so often and give it a good listen.
Notable bands/albums that are not prog related:
They Might Be Giants - Dial-A-Song
Sentenced - Crimson
Iron Maiden - Seventh Son of a Seventh Son
The Killers - Sam's Town
Iced Earth - Dark Saga