Obviously the biggest issue is metering. You need to be sure not to underexpose or you won't get crisp whites.... with any film.
Provia 100F, for my taste, blues up too easily. Watch out for that, especially at high altitude. There are warming filters specifically for this problem; I forget the number but I have one.
My choices would be velvia 100 and astia, and provia 400x if you need higher speed.
Amog the print films I would say reala, but it is no more Unfortunately the 160 films fight so hard to prevent whiteouts that you lose a lot of that slide-like pop. Maybe ektar would work but if you can get your hands on some reala....