Congrats on your new machine. You will love it. I love my 9700 it dose everything. There just seems to be so little time to play with it.
I agree on this:
Bobbins ... Some will look very close and you may be tempted to use them .... then you might wonder why your machine does not work right. Just buy them from your dealer so you are sure to have the right ones.
Also a little tip on winding the bobbins, make sure you have it threaded right or you will wind up with very loose and tangled thread on the bobbin (I did).
Yes you can save the thread by winding new bobbin off the old bobbin.