I think your best options, IMO, are the Remington Spartan 220 with double triggers, hardwood stock, cyl/cyl fixed chokes for around 300 or a little more, or one of the basic Stoeger coachguns with double triggers and fixed IC/Mod chokes for probably a similar amount. Single triggers and/or choke tubes are going to run you a bit more than 300 and external functioning hammers on a decent gun are going to run more yet.
There may be an exception, though. The distributor "Zanders" was running a sale on a Spartan that is not currently cataloged, Model 89554, which is a hammerless 12 ga. coach gun with walnut stocks, blued receiver, a butt-plate (no recoil pad) and comes with 4 choke tubes (Cyl/IC/Mod/Full). You should be able to get one of these for between 275 and 300 tops if they still have any in stock. Check with your dealer. The curent version of this gun, Model 89552, has a recoil pad, walnut stocks, nickeled receiver, and four choke tubes, and would probably run you in the mid to high 300s.
Go to
http://consumer.gzanders.com/. Look under shotguns, click on "ISP Cowboy Guns" and look at Model 89554 for one on sale.