If you don`t want to go the Nebula way and still
want it to be cheap then these are some of the best right now:
PSP sQuad EQ`s:
http://www.pspaudioware.com/indexen.html?url=http://www.pspaudioware.com/plugins/squad.html;

PSP oldTimer compressor:
http://www.pspaudioware.com/indexen.html?url=http://www.pspaudioware.com/plugins/squad.html;

Audio Damage EOS Reverb:
http://www.audiodamage.com/effects/product.php?pid=AD023

Valhalla DSP FreqEcho - and it`s free!!!!:
http://www.valhalladsp.com/plugins.html

I consider the FreqEcho to be one of the best
plugins I have!