For pumps a Mossberg 500, Maverick 88, H&R Pardner Pump, Stoeger P350, Winchester Speedpump, or a Remington 870 should all do just fine and be in your price range. I would try to get ahold of as many of those as you can and see which one feels best to you.
Once you decide what to get let us know and I'm sure there are plenty of people on here who can help with a choke/load combo.