G'day from across the ditch!

I'm heading over to the South Island later next month for a couple of weeks. I'll be bringing along a 6x17cm pano camera and was hoping for some suggestions for slide (E-6) film for shooting around the Alps.

Currently, I'm trying to decide between Velvia 100 and Provia 100. Any thoughts/advice to what works well there will be greatly appreciated!

I'll be carrying both 81A and an 81c Warming filters to help remove some of the blue light. Are these of much use?

Hope that these questions are not too stupid; we just don't get the amazing alpine scenery that you have here in Oz…

Thanks in advance.