I'm an ITB guy where this is concerned, so those caveats apply. With that said, I love the Slate FG-Red (already mentioned by several folks) for anything on the modern rock/aggressive side. The drive knob is really cool. FG-Grey is cool, too, (although it often loses out to the FG-Red!) and I do like it better that the IK emulation of the SSL Quad Comp which I also have. Can't tell you exactly why, I just can't seem to get the IK Bus Comp to sound right (although the grit button is cool and I do occasionally use that plug on something other than the 2-bus.) The IK compressor I do really like on the 2-bus, though, is the is the Precision Comp (the Neve 33609 emulation.) That one occasionally wins out, depending on the track.