I am a HUGE fan of Schwa (who is John Schwartz, one of the REAPER developers...cool).  His plugs are a bit different.  There is the CMX, which works as a doubler for vocals or anything really (nice)...don't believe me, check out this song, as I used it on the 1st acoustic heard.  The Dyno is an envelope driven compressor, which is very helpful with percussion or any difficult clip.  Oligarc is a whole palate of analog FX, which includes a filer, drive, chorus, and phaser.  Sculpto is similar to Dyno, but it can be in many areas.  Spectro is a frequency and time dependent spectral editor...very neat.  There are others too...  He has Olga too, if you like old style synths.

Schwa's site