groovy, well right now both marine equipment and nid gear for post release would be a priority, and we always need props.
Chromeangel would have a list of things but off the top of my head:
Space Marines:
Flamer
auspex
Storm Bolter
Tyranids:
Carnifex Ranged weapons
Stealer Claws (1st person)
Props:
Imperial City stuff
Rhino Transport
Tyranid Capillary towers
Tyranid spawning pool
Tyranid guant hatchery -
http://www.forgeworld.co.uk/bnest.htm