If your ambition is to eventually move up to a complex single then you wouldn’t go far wrong in choosing the AA5B Tiger as a transition plane. The Tiger as all Grumman singles teach you the importance of speed control and stabilized approach which I understand is an important factor in most complex singles such as the Mooney/Bonanza.
In the past most people I know who moved on from the AA5B went on to such aircraft including now the Cirrus’s, jumping past the PA28 retrack’s.