I'd say 2x Imp, 2x parasite and either 2x Djinn or 2x parasite. Extra tokens on everything makes it all better. This looks like a hella fun deck to play either way.
I don't know, I play-tested this deck and it runs pretty well. The corp can remove virus tokens at any time, making "de facto" Surge useless. All the card you mentioned are essential, probably I would drop 2 Darwin, but this has to be tested. And yeah, it's hella fun to play. :)
SURGE! (Seriously? It's begging for it.)