I love most of the ConCor PA series and the E8/9 series as well.
Based on my own personal experience, I would recommend avoiding the China (quality issue) made versions and the very old pre-Kato (Sekisui, good for its era) harder to get parts and usually worn out from old age & being run to death. If possible I want to see a photo of the BOTTOM. The old Sekisui made units had similar split lower chassis and the metal fuel tank area is metal instead of a black plastic part. If it has a headlight it should be at least 1972 or newer.
I prefer ConCor and Kato over most other brands, a personal choice. I have a few newer Katos and they are FANTASTIC, smooth and quiet. For DCC conversions I have had problems with the drop in board type conversions. I end up using DN135 Digitrac decoders and hard wire them in for better reliability. The ConCor DCC ready with 8pin med NMRA connectors are more reliable.
JD