PS:
@mboc said:
[...] On a side note, I've found the plug Decapitator by Soundtoys to be very helpful in creating harmonic distortion, taking the edge off, coloring (esp when used in parallel). If I could afford a Culture Vulture or a Fatso I would get them but the plug is quite good at emulating. This is just my own personal taste, but the demo is worth trying.
+1!
Another great source for nice harmonic distortion are UAD's Ampex and Revox emulations.
/Dietz - Vienna Symphonic Library