Small format digital is not a wise choice for still life IMO.
It lacks the detail, shift and tilt of any axis.
If you're going to do still life, use Large Format.
with all new stuff it's a bit expensive, but the detail from a slide that's 4 inches by 5 inches is drop dead gorgeous.
for $1500 you can have yourself a brand new slick 4x5 system with a 210mm standard lens that will produce more detail than any small format digital camera, including the 1Ds Mk III.
But that's not really as important as the shift and tilts. With a view camera, you can shoot a picture of a book absolutely head on and still see the side of it because you can shift the planes and than tilt them to correct for the perspective. It's impossible to do that on small format unless you jerry-rigged a bellows on it. Not only that, but you can correct for horizontals, verticals, you can rotate your plane of focus to be perpendicular, not parallel to the film plane. Imagine shooting a chessboard from an extreme acute angle at f/5.6 and getting the entire board in focus using a 200mm lens.