Quote Originally Posted by jcausey
If you're not looking for totally natural skin tones, look at the 100UC film from Kodak. Deep color saturation with bright, almost lurid colors.

I believe I've also heard that Konica Minolta has a color negative film with crazy-cool color saturation.
I'm not 100% sure but this may be Konica Impressa 50 which seems about to be discontinued and is rather slow. However if you can get it the newish Agfacolor Ultra 100 claims to have really vibrant colours. Alternatively Kodak Royal Supra (may be called something different in US) seems to be well thought of but that is about to be replaced by something called Elite Colour! Never used any of them I quite like bog standard Kodak Gold, Agfacolor Vista & Konica Superia Super!