On the ones you said I will go for KAV.But better choose Eset smart security or Avira antivir.Or in vista,Id say none.Just have a decent ad/spyware blocker.
Eset NOD32...elakiri.. I used KAS and BIT both..BIT nam tiakak hari hondai..KAS nam charter registriya kanawa...BIT ekath charter...anthimata balanakota