Not sure if anyone of these have been mentioned but will list them ayway:
15xx
Manning Wardle 0-6-0st (i know there different varieties but i mean in general)
A decent GWR Large Prairie, to finally knock the sales out of Hornby and the hanging on for dear life Airfix model
A 14xx (again same as the Prairie)
A1/A1X Terrier
B12
Probably no market for them but would love to see some of the earlier locos, Rocket, Planet, Lion etc
Met 1
Caledonian Single, 419 Tank and 0-6-0 Goods 828!
All in OO, yeah im not too picky on era, company etc, so long as they fit the bill for preserved members!
*Goes back to dream land*