for the gf im planning on buying her a jewelry box(shes been complaining about needing a new one for a bit now), and maybe something small on the side
brother/his gf - I usually ask them and they tell me what they'd like, its easier that way...
nephew - tons of toys
mom - new kitchen knife set
dad - anything Harley Davidson related...might also buy a set of pink handle bar tassle thingies and put them on his bike while its in winter storage