Well, the DC-9 spured on an entire family, which includes the DC-9, MD-80, MD-90, and MD-95 (717).
The DC-9-10 is the smallest version of this family. In a single class configuration it carries 80 with a range with max payload at 570nm. The B717-100 will be slightly larger than the DC-9-10. I believe the B717-100 will actually be closer to the DC-9-20, a version with the -10's fusealage and the -30's wings and engines.
The way to get across the atlantic with 1 stop with the shortest legs are Gander-Reykjavik-Shannon. Gander-Reykjavik is 1390nm. Gander-Shannon nonstop is 1738nm. So, theretically, a DC-9-30, 9-40, 9-50, MD-81 and B717-200 with typical loads could make it 1 stop. The MD-82, -83, -87, -88, and -90-30 could make it nonstop. This excludes ETOPS and all of those other things. The DC-9-10 and 9-20 could not make it with a typical load.
The models in this family are: