Well, I must say this is all pretty helpful and I've learned a lot, and I have a lot of confidence that as long as I have my "iPhone1,2_4.2.1_8C148_Restore.ipsw" file I will eventually be in good shape.
When I let iTunes attempt to restore, iTunes will eventally give up and insist it cannot find my iPhone for a revolving number of reasons citing all sorts of revolving error codes.
I have two concerns at the moment:
(1) Is it feasable my cheap eBay patch cables are really no good and causing connection issues?
(2) I'm syncing to a new notebook, for years my old one worked fine: is it possible my comany's firewall which I cannot disable is causing sync breaks?