I would plumb with PVC, because its widespread and easy to get. Keep in mind that with mag pumps, its suggested that the user should use a pipe with an id doulbe that of the output of the pump for maximum flow. So if your output is 1/2", using a pipe/tube with an id of 1" would maximum flow. I've heard of several people who've had flow problems with their mag pumps because they didn't use the proper pipe diameter.
If you're going to use the mag as a return pump from your sump, I would personally go with a mag7 or 9.5. Flow can be easily adjusted by adding a ball valve to the output of the pump.
-Richer
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