Top 5 most technical metal albums you know

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Eh, difficult to say which would go to the top...

But, no particular order:

Artillery - By Inheritance
Voivod - Nothingface
Cynic - Focus
Coroner - R.I.P
Atheist - Unquestionable Presence

(Honorable mentions:
Death's later albums
Other Atheist albums
Toxik - World Circus+Think This
Realm - Endless War+Suiciety)

[Disclaimer; These are more my "favorites" than the most technical I know, so shoot me, not changing it]
 
Spiral Architect - A Sceptic's Universe
Spastic Ink - Ink Complete
Behold...the Arctopus - Nano Nucleonic Cyborg Summoning
Exivious - Exivious
Atheist - Unquestionable Presence
 
Gorguts- Obscura (How has this not been mentioned?)
Cryptopsy- None So Vile
Demilich- Nespithe
Mastodon- Blood Mountain
Death- Sound Of Perseverance

Those are the first ones that come to my head. I'm sure there's more, I'm just too lazy to go through my music library.
 
Most of my top 5 have already been mentioned but I'll add:

Viraemia - EP
Anomalous - Ohmnivalent
Meshuggah - Nothing
Psycropyic - Ob(Servant)
Nile - Ithyphalic
 
Metallica - ...And Justice For All
Megadeth - Rust In Peace
Death - Symbolic

And, besides these classics, two less famous ones: Mekong Delta - Lurking Fear and Coram Lethe - ...A Splendid Chaos
 
Forget his postcount. When someone has a bearded nutsack as his avatar, you know he is well versed in all things metal.