I've got a 1300 Defender and it's realiable as a rock. The 1200/1300 line of shotguns is, IHMO, the best pump gun out there. I've had a 1300 Turkey for 17 years and it has never had a single issue, goes bang every time.
Defenders bring a bit more money then the other 1300s but they are still affordable. They can be picked up for $300-400 depending on your area.