Old MMT over old RB250 would also be my choice.
Misternice and Jperry are absolutely right, MDC 800 "The Arm" was designed by David Beltcher himself and machined by the same person. One of the best tonearms ever produced with metal bearings rather than nylon bearings found in other Sumiko tonearms. Counterweight placed as close to the bearing as possible. One heck of a tonearm.
I know that I may be in the minority range but the new Rega tonearms are, IMHO, way better than the old Sumiko MMTs.
Yes Schubert, people still complain that these still carry almost the same wiring and horrible little "clips" but they have been vastly upgraded in other areas such as improved bearings and a tightened spindle fit tolerance over previous models.
Each bearing suposedly individually selected to find the perfect match for the chosen spindle.
Brand new low mass precision engineered vertical bearing assembly. Completely redesigned arm tube to redistribute mass.
A much better arm no longer good for toasting marchmellows :-)