Specifically and most important:
Grey knight Terminator Daemon Hammer arm (s)
Grey knight storm bolter arm (s)
(working on a grandmaster mordrak conversion, I had my terminator chaplain standing in for him)
as far as bits go, I'd also be interested in any Thunder hammers, storm shields, or cyclone missile launchers, otherwise any terminators that you're looking to get rid of for a reasonable price, please let me know (any chapter/ heraldry or condition i'm not picky).
send me a pm with a price or if you're looking to trade