i like ektar 100 and fuji 160s or 160c, i forget which one.
im trying fuji provia 100f slide right now
i think the fuji 160c or s has awesome colors
I have never shot Fuji 160C, but I shoot a lot of 160S. It's probably my favorite color film.
I bought 3 rolls of Ektar 100 a while back. I've only shot one roll of it so far. Can't decide if I like it yet... It is
not a good film for portraits (if you want accurate colors anyway). It does seem pretty sharp though.
Fuji 160S however, is awesome for portraits, and is also nice and sharp.
Fuji 160S:

(EDIT - The wall on his left side (camera right) is a pinkish color ... that's what the color cast on the side of his face is from.)
(I'm not necessarily saying that these are 'awesome' portraits, lol - but the colors & grain are great. ...Ignore the dust spots.)
Generally speaking, I love anything Fuji. Fuji blows Kodak away, IMO.
And Fuji is pretty much the only one left making slide film...