ok, here goes..
Oatmeal - nice synth, comes with a handful of skins iirc, i like using this one
HGFortune synths - these are THE shit, especially for FX
Molot compressor - check the other plugins as well
Loudmax - Handy and simple limiter
TAL-dub TAL-dub II especially
Bionic supa delay
I definitely recommend BlueCat (for the Spectrum analyser, chorus and flanger) and Reaplugs (ReaXcomp, ReaEQ) bundles too