Velvia 50 has quite the contrast and saturation--mostly in the forms of Reds and Greens. I don't think I'd recommend it for your purposes. It's a very narrow film and I've had my fair share of shots that are 1/4 stop overexposed and it's toast. That being said, I once took a picture of light falling through a hole in a cave...there was a 7 stop difference and the film managed all of it (minus some blowouts in the main light). Give Provia a try. It's not as saturated, but ultimately you'll have more latitude.