A couple of years ago, an intercooled Regal could not be had for less than $6k if it ran. I sold my 86T Type for $7000 with 190k on it in less than a week. $4000 used to get you a roller or a worn out hot air.
With the new Fast and Furious movie approaching all the kiddies will want a Turbo Buick, prices/values might come up... Then again with the economy I dunno - it's a toss up!