I've found that the Ektar 100 with an 81a and a cp do a great job for autumn colors. I'm waiting for the chance to test out Provia 100f. I love the Provia that I've done so far, so I think I'll keep the love going if I can get in some shooting.
Provia 100F is a good choice for fall color too. Not as saturated as Velvia but I did get some good shots with the Provia last fall.
Shoot more film.
There are eight ways to put a slide into a projector tray. Seven of them are wrong.