As always on my mth wishlist...
NYO&W FT's sets (601, 801-805, 808) Already produced 806-807
NYO&W Single F3 A units (501-503) Already produced the only F3 sets, 821AB and 822AB
NYO&W 2-10-2 X-Class Bullmoose Erie purchased a set about the same time the O&W did but with different sized driver, larger I think. This could be done as an Erie/O&W offering with someone just being unhappy about driver size.
NYO&W 44 Tonners (101-105) I'd like the Grey paint scheme, but the maroon would be fine too.
NYO&W NW2 (111-131) Already produced 116
NYO&W 4-6-0 E-Class (225-228) I believe these were ex-Erie engines so you could do these in both Erie & O&W, maybe do a dulled down all black version and a dressed up one with white on the running board edges and tires?
NYO&W 2-8-0 W-Class
NYO&W 8300 series cabooses
NYO&W Two Bay Hoppers
Preferably all Premier