I have to say that the recommendation to speak with Diggory Hadoke was the best advice on this thread. I've owned more than a 100 fine shotguns and I confess that the quality and finish of all the initial brands rattled off are quite low compared to British guns.
You can get a soul-filled fine Birmingham 20 bore boxlock from the golden era that is an appreciating asset for the same money as an Arieta, AyA, Garbi, Union Armera/Grulla, Parker Repro or the ever-dreadful-total-garbage Tony Galazan CSMC RBL guns.
Keep in mind I shoot a best grade 217 Grulla 12/16 bore at present for my daily shooter that I put away wet and abuse in general. MSRP $18000. Purchased for $4000. Worth: $4000. It is by all measures a PoS when compared to any hand filed, utility grade boxlock ejector made in Birmingham. The engraving quality of the Spanish and German and Belgian and French stuff on the whole is inferior to the British. (some occasional exceptions)
Once you go Brit, you never go back. I only own a Spanish modern gun because it has chokes, shoots steel and has 3" chambers for fowling. Otherwise, give me ANY brit gun and I'd be much happier.
Example: Found a lovely Churchill XXV 20 bore extractor that had a stock extension so it had lowered value. Mint Galazan has one for $12,000. This one with a chopped stock went for about $2000. There is no modern gun its equal for 3-4x its price. It was just a deal because it was converted to extractor and because it had a stock extension. Life is too short to accumulate ill fitting, rough made guns. Go vintage Brit.