One weekend in NYC I wandered into the Holland and Holland store with a couple of good friends. We found our way up to the gun room and proceded to--with the exclusive attention and approval of the attendant--to fondle several amazing doubles. There were matched sets of 20 and 28 gauge side-bys, double rifles in any conceivable caliber (.22 Hornet to .577 Nitro) and gorgeous single shots. My personal favorite was a .500 Nitro double rifle with deep Celtic knot and dragon engraving. $180k.
I love German, Italian and American doubles, but the H&H is painfully elegant. For now, a Beretta 687 handles my sproting clays, but if I ever win the lotto, I'll be flying to London for a bespoke double.