I'm having an awful time deciding between Canon and Pentax

i´ve read like you say that the auto focus is way better on Canon than on Pentax. I have only experienced Pentax K5 out of the two and have lotsa lenses, but have had no problems with the auto focus for my use. But I think if it´s for pro use the Canon is the better choice due to the auto focus, cause you cannot afford to loose any at a wedding etc. If that´s not important to you then I would choose the Pentax K5 due to size etc, in my own case I have not regretted my choice, but it all comes down to personal preferences, so only you can know what will satisfy you

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