I'm glad to hear you enjoyed it. Shooting can be very fun. I agree with the other guys recommending a .22. They are a blast to shoot and you can go through several hundred rounds for little money. The .22 is the best bang for your buck in guns imo.
Get a Ruger MK I II III or a Browning Buckmark. They both can be had for not much money. Used ones are fine too. If one of those is maintained at all it will last another few hundred thousand rounds. If you prefer a revolver there are plenty to choose from also. I own both.