You'll probably hear cheerleading squads for Beretta,Benelli, and Browning at the very least when it comes to autoloaders. There will be more brands than that being touted as the best if you consider an over/under. That said, if you want a good pump I'd probably go with a Mossberg 500 or Remington 870 Express. Both are going to be pretty inexpensive, but are going to be rough cycling out the box. They'll both be reliable, though, and it doesn't take much to get them to function a lot smoother.