After the A class it seems to me with variety of liveries, 2 1/2 preserved examples, and similarity to an A. I think it highly likely that we will see one in years to come. AEC Railcar sets also have a lot for northern irish and irish models so i would place them after. Then followed by a sulzer in likeliness. After that......RTR steam loco, Class 80, D/E/G Shunters, re-run of existing model (071, 141) ect. Are all possibibilities that are about level after that Though im sure this is a debate we have had many a time
I think for a "what if" people might be interested. Cant say i would 100 percent get one cause my era is completely different but i got a grey 121 for west cork, so I'm sure late 90s early 2000s modelers could make that situation works