I suspect a Ruger double action revolver would also be pretty cheap to maintain. It will never have the feel of a Colt Detective Special, however.
I have no doubt Denis is right about the need to adjust the DS at 6,000 rounds through it, but think about that for a second. At today's prices that's $5,000 - $6,000 in ammunition costs. I don't expect I'll ever put that kind of money through my DS; to me, it's a functional piece, not a range piece.