I don't really think upgrading is all that frowned upon if you start with a basic field grade and especially if it is in less than perfect condition. Of course you want a mechanically sound gun to start with. The problem lies with spending more than you will ever get back if you ever want to sell it. Now this is just my opinion after looking at many doubles for years now but I think you're best bet on the value issue is with a Parker or a Fox, people seem to be willing to pay pretty good sums for well done upgrades in those two makes.
