I like Velvia because I shoot mostly in overcast and/or Pacific Northwest forest lighting using a tripod, since the colors get wiped out in flatter contrast, less punchy films. Velvia looks artificially intense under bright lights, although for some styles of photography that is a good thing. But it would be a silly choice for handheld action (or forest) photos or indoor pet pix. Negative film has a wider contrast range, so you will lose less detail in the dark/bright extremes, but you can't see a "true" version of what is on the film since so much varies with processing. So -- it depends.
The 8MB digitizing offered by Wolf is good enough for a lot of things, but not for making larger prints. The 8MB size can be achieved in a number of ways (before or after compression), so it is unclear what it actually means. Generally speaking, each pixel in a digital file is represented by 24 bits of data, 8 bits for each of the three primaries, or 3 Bytes (one Byte equals 8 bits). So you would have 2.67 million pixels of data, or roughly speaking, a bit more than 1300x1950 pixels of image data to work with. At 300 pixels per inch (the usual standard for good quality small prints) this gets you a 5" X 7" print. But on a computer screen, this yields VERY LARGE image.
A couple of readings:
http://www.photo.net/equipment/digital/basics/http://www.normankoren.com/pixels_images.htmlAnd for those in the Boulder CO area:
http://www.normankoren.com/Boulder.htmlAnd my preferred image processing software:
http://www.dl-c.com/