you are approaching this with the wrong attitude == there is a lot of really nice glass out there, no reason to buy defective stuff with the idea that you will have it serviced -- servicing costs will eat up any savings over buying good to start with (voice of sad experience talking here).
plus some servicing can bite you in the butt -- that haze? Might not just be haze, might be etching on the glass from oil outgassing requiring a new lens element. This happened to me, cost $200 for a 2.8 elmar 50mm.
Buy local or from a reputable dealer like KEH.