Top show quality is usually reserved for a kitten/cat that is campaignable for a regional or national win.. would grand in 1 or 2 shows when presented in condition.  It is VERY difficult to buy a top show silver or golden.  They are so rare that most breeders will keep them for themselves.  

Show quality, to me, is a cat that has no disqualifying faults and is competitive in the ring taking many best of breeds when up against competition.  Will usually grand in a few to several shows.  Any cat that is not competitive in the ring (but has no disqualifying faults including insufficient merit) is breeder quality in my opinion.  

Tracy

Fran, thank you for asking. I wanted to know the same thing!  And thank you Tracy for making your response so easy for us pet owners to understand.
Best wishes,
Joan