In regards to camera profiling, read Adobe Camera RAW Calibration
. If you want to use a custom profile, shooting RAW is mandatory.
Canon has 3 tilt-shift lenses that allow movements similar to a 4x5 camera in 24, 25, and 90mm focal lengths. Unless you plan on consistently printing larger than 24x36, I would recommend skipping LF film and get the 1Ds-MkII. If you don't anticipate printing larger than 16x24, then get the 1D-MkII (with its 8FPS frame rate and 20-frame buffer) and use the extra money for glass. You may want to consider both, since by the time you get a LF camera, lenses and accessories, and a decent scanner, you could end up spending nearly the price of a 1Ds-MkII, and then you have the dollars-per-frame cost for film and processing plus the time and effort it takes to scan the film. If you plan on shooting very much, it won't take long for shooting LF to cost you more than the 1Ds-MkII.
If buying both bodies is financially unacceptable, decide which is more important, and choose your body accordingly.