I was just at Axiom 2 days ago. It is amazing how closely they examine things and any blemish and it doesn't go out as "regular" stock. There are stories all over here (mine included) about "scratch and dent" from Axiom and people not noticing anything wrong. On another related note, those are cosmetic blemishes (if you even see them) only, nothing performance wise.
I would go with something direct from Axiom unless you know and/or trust the seller
Oh, and you will love the jump from the 150 to the 180. I made that jump and I am glad that I did.
