Depends if you are shooting with the slide as your final product (say for projection) or if you're wanting to have a piece of film that you can scan to create a digital file for digital projection, display on screen, printing etc.
If the latter is your goal, you might want to consider Fuji's Astia 100. It is far lower contrast than velvia or provia, and the colour reproduction is very accurate, and it scans very nicely on consumer scanners which aren't known for their abilty to handle high contrast. Astia's blue reproduction is particularly nice, not the magenta-blue of the other fuji films. Its very nice for natural light/clear water/big blue images.
So you can shoot Astia, make a nice scan with lots of information and add your contrast and saturation enhancements in Photoshop. It's a lot like shooting RAW digital files and adding your preffered characteristics to images as required.
Is there an Astia 100 and Astia 100F? If so, is there any difference between them?
How do print enlargements turn out (8x10, 11x16) using these films for u/w photos?