Anyone have any recommendations for an auto adjusting perfect binder that would be best suted for on-demand short run (1-off) work?

Under $15K list or half of that used would be great. Duplo has a cute DB-250 that manually loads, but seems to run through the process automatically, and Bourg has the BB1001 and BB2000 units that look nice. Anyone with any thoughts about any of these units or something else to recommend?