Regarding the other issue in your post--once you've registered your Kindle, you really don't need to connect to wifi again. I buy books from Amazon and download them to my PC to transfer via USB to my Voyage. And I install the firmware updates when I'm ready to by downloading them to my PC and copying them over to my Voyage. I don't use Amazon's cloud for anything. Since my Kindle is never connected to Amazon's servers I'm not able to sync my position between devices, which isn't a big deal for me--the only devices I really read on at all are my Kindle Voyage and my Kobo Aura One--and I couldn't sync between these two anyway.
Also I don't use collections and from what I've read here, if you do use collections it's a lot easier to do if you connect to Amazon's cloud...
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