I have 2 Brother emb/sewing machine mine are mid-range in price.
I agree try to go with one that has the largest emb field you can afford.
At least a 5x7 you will be MUCH happier with that size as to the 4x4 only.
If you can afford it I know MANY people who have the Brother PE770 series
and are happy that is it embroidery only and has a 5x7 field.
I have seen this machine priced at $599 to $699 if that is something in
your price range.
Good luck and keep us posted on what you get.
Also there is a post (you have to hunt for it most the time) where many of us
talk embroidery machine and designs.