I am guessing you have a model 870. It is a edition of the 870 shotgun
Depending on condition, the 870 Express is about $450, the 870 Wingmaster is about $725.
This is strickly an opinion, but the Remington Model 870 Express would be a good choice. It is an in-expensive quality gun.
100-375 USD
Midwayusa.com
Remington 870 Express Super Magnum.
100-1000 depending on specifics
100-300 USD
$350
About $325-$350
Around $350 depending condition.
The average price of a Remington 870 Express Magnum pump 12 gauge shotgun "brand new" is about 300-450 dollars. I got mine used for $250