>>3586547Pick Provia or E100 as your general purpose. It really comes down to which you prefer. I prefer Provia's colours so I'd go with that. You can also push either option to 200 with very little increase in contrast/saturation when you need an extra stop of speed.
I also prefer Velvia 50 to 100. 100 is the most contrasty slide film available and in SE Asia you'll have plenty of light to work with for 50iso. I probably shot 25 rolls of Velvia 50 while over there. Again, you can always push it 1 stop if you need to.
Pic related: Velvia 50 pushed to 100 shot in Indonesia.