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the std won't do off camera flash
Off camera flash controlled by the pop up is one of the main reasons you pay more for the Sigma Super range of flashes. The others include being able to dial in flash compensation on a body that doesn't offer it, hi speed synch, and having more control in manual modes.
The std range are really designed as more powerful point and shoot type flashes, although you can get by some of the limitations using the K10D and K20D because they have flash compensation and slow shutter synch control through the body.
If you must go with the Sigmas the Supers give you more room to grow.
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