A Dillon SDB will do pistol rounds if thats all you will want, but the dies are proprietary. A 550 is probably the way to go. Go to
http://www.brianenos.com/store/dillon.html His prices are the same as Dillon but he ships free if you order over $400. The 550 is a great press but if you think you need more go with the 650.
Dave