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What sort of scope and mount would you be using Heath? Prime focus is the usually preferred technique whereby the DSLR is mounted without a lens such that focus is reached on the DSLR sensor. "Magnification" depends on your scope's focal length.
Its usually preferable to avoid barlows while you're starting out, as the extra length creates a greater moment arm for movement/flexure, more difficult balance, and the longer focal length makes guiding a LOT harder. All this applies a lot less if you're talking a webcam for planetary work - then you really need the extra focal length for resolution and short exposures mean movement in focal train less an issue.
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