I've seen a lot of threads about using HiRes network cameras for HD. But what about for stop motion capture? Is there any quicktime capture compatible solution out there? I'm tired of the DSLR way of doing this and looking for an alternative.

You might have a look at BTV Pro, or iStopMotion, or do a Google search to find other programs.

When doing a stop motion or time-lapse for HD, even with software capture, I still aquire with a DSLR camera, as it provides the best bang for the buck, with higher quality than an HD camera and interchangable lenses.