There are some that I may still save up for and then there are some that will have to wait until I either win the lottery or become independently wealthy. Really just one or two would do it for me. Some that I would eventually like to save up for are:
A full custom Ruger Bisley in .500S&W 1.4". Fitted with a 4¾" octagon barrel, Colt ejector, custom express sights, ivory or French walnut stocks, perhaps some sort of topstrap conversion, roundbutted, fitted with a lanyard ring, maybe 50% coverage engraving, completely blueprinted and handfinished. Either full carbona blue, or color case hardened with a traditional brown finish on the barrel like Seyfried's #13.
A fully engraved, full carbona blue USFA, .44Spl 4¾" SAA with carved ivory stocks and dovetail front sight.
I've got an Old Model Blackhawk that I want to convert to a 7½" .38-40 with a Power Custom Colt-style grip frame, full blue with custom sights and carved ivory.
Further down the list, I'd love to have an old British double. Preferably a 20ga or smaller. Doesn't have to be elaborate.
I'd also love to have an original rook rifle as my be-all, end-all small game rifle. I want it chambered in an original, long-obsolete rook rifle cartridge that it takes all day just to make a few cases for. I'll load it with cast bullets and shoot the hell out of it.
Another on the list would be a high-end .22LR boltgun. Perhaps a Cooper with extra fancy wood, case hardened receiver and mounts, maybe an octagon barrel. Top it with a Leupold.