It' hard to put a value on something like this, it's a house brand so there isn't a real collector base for them and they do not sell often enough to set a stable value. That one on GunBroker has been getting relisted for quite a while, but it has probably had the barrel cut and has an uneven finish that I think looks like an old cold blue. It's definatly over priced and not a good reference.
Premier Pump
I have just not seen enough of these sell to give you any sound advice on a value but the one you describe sounds like it is a nice example.

A couple things to look for on these, loosen the takedown screw so it's just snug and see how loose the reciever is - most of these even in real good condition have much more play than any other takedown design. Look very close at the trigger pin on the right side, this is a weak spot in the design and if the gun has been dropped they will often crack through at this spot. Here is a picture I took a while ago that shows the weak spot.
[Linked Image]

Last edited by GeneB; 04/07/10. Reason: added info and pictures