I had a 1974 G26 and it was a great boat. They don't point well to the wind, but are very stable and forgiving. I loved the standing room for a short boat and the big cockpit.
As far as things to watch out for, nothing in particular. Just keep her in tip top shape and you'll have her for a longtime. Some nice additions would be a furler if you don't have one. What kind of holding tank do you have? Mine was aweful, it flushed with the contents of the holding tank....so basically flushing with old piss. It reaked after a few days. Check it out and let me know. I would recommend changing that ASAP.
Good luck, she's a great boat.