The most budget-wise machines with a 9" harp are the 1500s mentioned, Janome 6300, 6500 and 6600. There are many other models with wider harps in all brands and price seems to be much higher as though priced per added inch of harp-space but the more the better. I use a 9" harp machine and agree with the person who said type of batting can make a difference AND plenty of support behind and to the sides of your work area. I would not attempt a king size on my machine but I know it could be done. The Ambition is a nice machine and should handle up to double-bed size without much problem for you. Larger could be done, of course...it just is more challenging than fun at times.