The diamond-plate version doesn't appear very often. I saw one listed with some paint cracking & corner dings, & it sold for $5,000 within two weeks.
As there's demand for this model, I warn buyers to beware of buying them. They're easy to counterfeit, & you might be handing over thousands of dollars for a China guitar (stamped MADE IN U.S.A., of course) that's not worth $200.
If you are a serious buyer, then go to a serious music store, with at least $3,000 in-hand. Ask THEM to find you one, & to guarantee it's the real thing AND there's nothing wrong with it AND it's not stolen. They'll likely demand a down-payment on the spot (some of it non-refundable should you change your mind).
What do you mean by "ST models"? The 3ST is worth double the STPRO, which is worth double the 2ST.