The PE770 and the Designio820 (same machine-different color) are great beginner machines. They're workhorse machines and pretty easy to use. If you decide you want to upgrade or that machine embroidery isn't for you, you can always sell it. It's a popular machine and someone is always looking for one.
That being said, I have 2 Brother and 3 Janome embroidery machines and they're every bit the workhorse Brother machines are and I find them more user friendly than the Brothers.
Cari