The two most popular autos I see at the range are the 1100 and the newer Berettas.Bruce Buck, the Technoid over at Shotgun Report, says the 1100 is the more short lived of the two, and willl start busting small parts around 35K rounds. If certain parts are replaced as PM, much longer life.
The newer Berettas 390,391, seem to make a lot of shooters happy.
Both of these will run over 7 1/2 lbs, if a tyro can hold them up and swing them, they're good choices.
You mention putting more lead downrange, so I'll skip the usual lecture about light loads. Just know that life's full of tradeoffs,and shotgunning is part of life.