I would go with the 3129 it looks similar to the pc-420 off of amazon, the 700t looks similar to cs60001 or sq9050 feature wise. The pc-420 off amazon runs around 400 so the sb3129 will probably be a little more since it is a dealer machine. Check out the pc-420 off amazon, those are very popular and have a lot of nice features for 400, and get good reviews
http://www.amazon.com/Brother-PC420P...brother+pc-420