I have a Brother pe770 and a Bernina 640. The Bernina is much easier to use as the screen is so clear and I can see it better.
Do your home work 1st, (which you are on the right track) and check out what features you want and make sure it has at least a 5x7 stitch field or you will wish you did (I know from experience).
Remember stabilizers are expensive! You have to use embroidery threads too, not regular sewing thread.