Condition and what needs to be put right in a service will have a huge effect on the price. It's not a model I've ever followed, but if you look at the price differential under the steel model for an older used Daytona, you won't go too far wrong - then add in new gold crowns (as a possible requirement), crystal, and a service and you won't be too far away. The Bi-metal Daytona could be a bit of a bargain buy, if you like the look.