I don't stick to any particular insult, apart from perhaps the more basic ones like idiot, etc. My best insults really need their context.
I like to think I can pick out a good insult when I hear it though, so my contribution will be from Legionary Titus Pullo in Rome(tv):
"Piss-drinking sons of circus-whores".
deshorty said:
Personally I like a bit of Shakespearean insultage. "You acorn" comes to mind, as I type, quite intoxicated.
If I could be bothered with digging out my Illiad, I'd raise you one Homeric insult ^^