Mossberg 500 is alloy receiver, lightweight. Remington 870, steel receiver, heavy. Browning BPS, steel receiver, heavy. Winchester SXP, alloy receiver, lightweight . All reliable. The cheapest might be Winchester SXP. The downside, not much accessories for Winchester SXP and Browning BPS. Beretta and Benelli also offers entry level pump and semis, but for a lot more. Depending on the purpose and budget, I suggest, like most of us here, go and try as much as you can get hold of from clubs and stores. Weight, LOP and the feel of the controls, find something that will fit your need and budget.