I second buying a used shot gun to get a well made gun in your price range. a Remington 870 which there are a lot of variations in will cost even for the express will be near 350.00.
Shot the mfg. web sites to learn about them instead of the retailer.
http://www.remington.com/product-fam...model-870.aspx
Some Remington's come with one choke tube, Some do not have screw in chokes rather fixed ones.
http://www.mossberg.com/product/shot...2306,2307,2517
Mossberg site I didn't really care for but there is information there if you want to look.
My first new shot gun was a Ithaca model 37 Featherlite 12 ga.with a fixed Modified choke. It has served me well for over 50 years. I acquired a 20ga same model and choke set up I seem to use more these day.
I consider it one of the finest shot guns ever made and are not cheap to buy even new. As a reloader I like the bottom eject of hulls, No more fishing them out of the water when duck hunting out of a boat and drying them for months so they could be reloaded. Also still made in the USA.
http://ithacagun.com/featherlight.php

Al