The Vertigo from Plugin Alliance is amazing. I don't use it for heavy compression, and I usually use it with other compressors, like the Renaissance Axe, or 1176 or LA2A/3A models, but at light settings, it just adds something to the tracks to make them 'breathe' better. Less flat and dull, and more depth.
Renaissance Axx for guitars (just to level out the dynamics a bit, especially to clamp down on palm mutes and make them more consistent with open notes). CLA 76 for anything heavy like a drum rooms, bass, vocals, anything that needs a bit of nice crunch and saturation, things like that. It's great for parallel compression as well. SSL Channel strip for something more transparent, typically for toms and snares, acoustic, vocals as well sometimes. SSL Comp for master bus every time, just adds this gorgeous but subtle glue to everything without coloring it too much.