It seems that most of the people that use a DSM on a Grace frame (or similar) are not satisfied with the amount of quilting space if they are doing bed size quilts. Definitely try out lots of different machines and set ups (standard long arms; mid-arms--both stand up like the BlockRockit and sit-downs and even the frame & DSM set-up). And keep one thing in mind--while you currently do mostly stippling and some edge2edge, that could be just the beginning if you got a easy to use machine!