Definitely under $1k. About $600 after auction fees and shipping. I still plan to primarily collect Roman coins but there are a few representative Greek coins I'd like to get like a nice Corinthian stater, and a nice lifetime Alexander tetradrachm.
You will probably save a bit of money if you don't insist on the lifetime criterion. There are many coins that may or not be lifetime, but worst case scenario they were struck within a few years from Alexander's death. I have seen many coins like that (mine is such a case) that were usually struck in the cities that Alexander build during his campaign.
The earring is clear. Behind the earring is an extension of the helmet's neck guard and is comprised of a chain of metal links extending from the side of the helmet, to the bottom of Athena's helmet. As with your coin, a really nice one, by the way, the chain neck guard can be seen in the example below, in the lower right. Depending on the centering of any given Athenian tetradrachm, the chain neck guard is completely visible, partially visible, or not visible at all.
The Owls are great in hand. Not all Roman coins are flat. Some of the small cast pieces have some heft.
Of the Athenians. She's a beauty with a beguiling archaic smile and she'll still be around after I'm long gone.