old timers - Fox, Parker, LeFevre among US names - only the Fox is still in production by CSMC - they now start at $15,000 and go up from there. CSMC also has their line of RBL guns - good guns, they start at a more affordable $4,000.
Modern guns? - Lots to choose from - English, French, Spanish, Turkish, Japanese, Italian and some really cheap junk from Russia, Brazil and China.
Personally I have always liked the Spanish AyA, although the Ugartechea from Spain is a tad more affordable. AyA is even sold through Cabela's Gun Library. AyA has the look, feel, and balance of a fine English gun at 1/10 the cost. S&W had a double built in Turkey (and NOT from Huglu) that is an excellent gun - real color case hardening, well-regulated barrels, rounded trigger plate action, etc.......a nice 20 gauge for upland birds.
Brownings and SKBs, while well built, are just too heavy for lots of walking in the uplands, but are well made