i'm 6'1" tall,
i ride a 25" (63cm) (self contained touring) B/N 6000t
i ride a 60cm (23") road bike - cannondale sx600
my 'bent is totally adjustable (bikeE ct standard)
are you going for a road bike? go for smaller frame if mtb!
i had a 56cm giordana sx, WAY (much!) too small!
like mentioned above, test ride it and haggle price for used bike~