Oh you lucky duck! I have been wanting a PE770 since they came out. My regular sewing machine is a Brother, and I don't think I would have anything else.
I can't give you any advice, since an embroidery machine is still on my wish list, but I can give you a link to a phenomenal website:
www.everythingsewing.net
The members are ahh-
mazing. Everyone from the rank novice to sewing teachers and professional designers are always willing to help, offer suggestions, and generally cheer you on in your endeavors. There's even a Yorkie or two around!