Dave, I'm not a demanding sort of person but as it's a wish list........
Southern Region EMUs. EPBs (although I suspect Bachmann have that covered R&D wise), so I'm thinking VEPs, CIGs and 455s.
I know that in OO the EMU sales are indifferent but in N gauge, I really think it's an untapped revenue earner. But, then I have to ask myself, if there was money to be had we'd have seen more EMUs being produced.
Anyway, those are my thoughts.