I have an old Dillon 300(550's grand daddy)set up for all small primer calibers.My SDB is set up for all my large primer calibers.Considering the price of the dies for the SDB,if I'd redo it,I'd buy a 550 instead of the SDB.
To me,reloading is a nice moment of quietness that makes me relax.I do not reload for high output.I take my time.The old 300 will yield around 150 rds/hour while at the same rythm the SDB will add another 100 to this.
Whatever you buy,enjoy!