^^ LOL
I'm surprised nobody has listed the best prog metal album ever made... Symphony X ~ V!
I highly, highly recommend The Perfect Element as well, since it is in my top 3 albums of all time.
I am another that got into growls because of Opeth. You can't go wrong with Ghost Reveries! Once you let yourself accept the style, you will be hooked for life...
The thing about PoS, btw, is that their first 4 albums were pure gold. 12:5, live acoustic album sends chills down my spine as well. Gildenlow is one of the best singers in the world, as far as I'm concerned. Start with PE, and then the remaining 3 of their first 4. You will NOT be disappointed.