The Collaborative International Dictionary of English v.0.48:

choosey \choosey\ choosy \choosy\adj.
   difficult to please, especially in details.

   Syn: particular, fussy.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

choosy
    adj 1: difficult to please [syn: choosy, choosey]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "choosy":
   adoptive, appointive, censorious, choicy, choosing, conscientious,
   constituent, critical, demanding, difficult, discerning,
   discriminating, discriminative, eclectic, elective, electoral,
   exacting, fastidious, finical, finicky, fussy, hard to please,
   meticulous, particular, perfectionistic, picky, precise,
   precisianistic, priggish, prudish, punctilious, puristic,
   puritanic, scrupulous, selecting, selective, sensitive, strict