Proggy in which way? I'm guessing you're looking for heavy/technical prog (as most already mentioned fit in), or are you also interested in prog/power and "softer" prog metal? For my bit I'd say Coprofago - Unorthodox Creative Criteria (Meshuggah meets Cynic/Atheist), Spiral Architect, Angra - Temple of Shadows, Scariot - Momentum Shift (thrashy! plus has the great Steve DiGiorgio), Vanden Plas - Christ.O, Ihsahn - Angl, Shadow Gallery - Room V, Pagan's Mind - Enigmatic:Calling, Ayreon - The Human Equation, Behold...The Arctopus - Nano-Nucleonic Cyborg Summoning, Communic - Visual Waves of Decay, Circus Maximus - Isolate.
Plus I have to throw in my all time favourite album (which I'm listening to right now) - Evergrey - In Search of Truth. I'm still drooling over their MB TriAxis/Peavey 50-50 tone...
Pretty much any type of prog! I do tend to lean towards the stuff that sounds similar to Evergrey though. They are one of my favorites.
Cheers.
-Joe