The Mossberg-made Maverick is available locally for less than $200 brand new in an ideal "house gun" configuration: blue steel 18.5" cylinder-bore barrel & regular length magazine tube(total capacity 5 + 1 with 2 3/4" shells), black synthetic stock. It's very similar to the Mossberg 500, but has the safety button on the trigger guard(front, like the old Winchester pumps) instead of the top rear of the receiver like the Mossberg. For a new gun, the Maverick is time tested & excellent value for the $$. I believe it's assembled in Mexico from USA-made parts. For some more $$ you can get the Mossberg or the Remington 870 Express mentioned above. The Remington also has the safety button on the trigger guard, but on the rear.
For used, it depends what you can find, but the Remington 870 would be at or near the top of my list. I've owned a 20 ga 870 since my 12th Christmas- and that was a very long time ago!