I have three Brother machines and a Pfaff. Right now if I had a choice, I'd buy the Brother PR650. It's a small single head machine but has larger hoops, hat hoop, etc. When I think about all the money I've spent on these machines I could have had one of those for a lot less. It's a little more in price than the sewing/embroidery machines, but look at all the options you get with it and the sizes of the hoops you get. It also has a hat hoop which is a really nice feature if you plan on a small business. The hat hoops with the home machines aren't the easiest things to use.
You'll invest a little more in the beginning but probably be happy you did, especially if you already have a machine you like to sew on.