Apart from the above, I believe you will need some form of remote release, and fitting to go between this release and the PC. They are call GPUSB or similar.
I bought a very cheap remote for my 20D and got Robby to conjure up a serial to release fitting. They are (or in the case of a VERY new model) or will be available somewhere, likely overseas. Hap Griffin is a name that springs to mind.
Good luck, both sound nice, although I wouldn't chase the pixel count too much.
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