Difficult to know what you mean by "economical". What is your price range? What sort of reel are you replacing? What you want from the sounds of it is a good disk drag based reel. There are a lot of them on the market. From Echo, to Ross, to Orvis, the price range is $80-150 or thereabouts.

Oh and be forewarned you'll get a bunch "you don't need a drag on a trout reel" responses, and these can be ignored. Obviously you've already found a need for a drag. Good luck.