Grummans are definitely very nice aircraft. One year ago, Genghis the Engineer, who himself owns a share in an AA5A and will hopefully add some useful bits to this topic, too, helped me buy an AA5B. Today, I flew it back from an annual. Over one year of ownership, the Tiger behaved very well, never let me down, forgave some stupid things on my part, and taught me not to repeat them.
AA5A is not very powerful, but its MTOW of 999 kg will save you landing fees at many airfields; AA5B is over a tonne, but it's considerably faster than C152/C172/PA28 - essentially, it's a budget tourer with a very good price/performance ratio.
AA5s have an excellent lookout from the cockpit. Another nice feature is the folding back seats - you get a cargo compartment with a flat floor almost 6 feet long, which is very convenient for bicycles and may in a pinch serve as a place to sleep.