And as much as I realize doubles should be judged by their quality not the name on the side plates, I have desired either a Holland or a Purdey for many many years!
Crusher, I have a system that values Brit and Continental guns. The three factors for value are Brand Value level, Original Quality grade, and Current Condition level. Take note that BV and OQ are separate and distinct factors; one does not necessarily imply the other. Hence the proverb, "Buy the gun (OQ), not the name (BV). Proverb or not, you will pay for BV when you buy; that is just part of the market value. Your wallet will be well served by understanding where the value comes from for the guns you buy. Your mind will be well served by buying those things which you really desire, but within your budget. Looks to me like you did well.
DDA