I favor my copy of 60-250 even more than FA limiteds. I really like images it produces and reluctantly mount other lenses when something wider is needed. If not its size and weight I would even consider selling FA 77 ltd for I don't really use it after getting the lens. My thoughts after couple months with the lens in possession:
SMC Pentax-DA* 60-250mm F4 ED [IF] SDM Reviews - DA Zoom Lenses - Pentax Lens Reviews & Lens Database
There is one severe drawback, however. Whenever I use it indoors in dimly lit conditions my K-5 often struggles to lock focus. Brighter lenses do lock in the same scene almost instantly. I'm not sure if the lens is to blame. Maybe something is wrong with its SDM mechanism. Outdoors AF works good enough.
So from that perspective I think K-3 or K-5II would do better because of updated AF module.