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Bill-
Steve's right on with what I was thinking. I'd suggest aperture priority set to f/5.6, ISO 100 (or 200). Unless you absolutely need it, I'd avoid apertures over f/8 because of the effects of DLA (explained below). I've never used Auto ISO because ISO is something I always want to set manually depending on the amount of noise I'm willing to put up with in a given situation. Considering you're shooting snow during the day, lack of light should not be a problem for you.
From Bryan Carnathan:
"DLA (Diffraction Limited Aperture) is the result of a mathematical formula that approximates the aperture where diffraction begins to visibly affect image sharpness at the pixel level. Diffraction at the DLA is only barely visible when viewed at full-size (100%, 1 pixel = 1 pixel) on a display or output to a very large print. As sensor pixel density increases, the narrowest aperture we can use to get perfectly pixel sharp images gets wider."
The DLA point for a T2i is approximately f/6.8, meaning using apertures above that can result in a visible loss of sharpness.
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