Punishment For Decadence is great. Easily Coroner's finest moment.
RIP and No More Color are also good, the latter a bit more than the former.
Grin and Mental Vortex suck hard.
For Obliveon, I like From this Day Forward, but Nemesis was a weak follow-up. I never listen to it.
Voivod is also great from their beginning up to The Outer Limits (minus Angel Rat -- that one sucked).
The first Watchtower album, Energetic Disassembly, also deserves mention. Just avoid their second one (Control and Resistance), which was basically them moving away from speed metal and becoming typical lame "tech prog."