Well I'm no expert but I think I can say...
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2. I have two webcams lying around. if I opt to use them instead of my Panasonic HD video cam and Canon FS10, doe sit matter if the webcams are different brands? One, is a Logitech, the other a Philips, I don't see what models. I suspect I have a third one packed away somewhere but will look for it later.
No particular problems using different webcams, but it can be tricky. they must record with similar fps and resolution. If you have one that is low quality, the others will have to be adjusted accordingly. Not all webcams have manual controls, so it can become hard mixing them.
So, it's possible to use different cameras but it's generally easier to use one model.
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3. Does video quality impact the appearance of avatars or is the issue actually video quality and iPi's ability to track or record the motions?
If I understand your question correctly, video quality will ONLY impact the tracking process, not your model. if you have reaaaaally poor quality iPi might have a hard time tracking your actor. But still, a decent webcam isn't really hi-quality and is still enough.
As for iClone, I don't know but there are others users here that use it, I think.