Just a suggestion that would suit my searching style better, if this is possible or not.
In the Advanced Search, I would like to be able to search by region. As there are more sellers from various countries and more items listed, a buyer might want to narrow the search field more.
Also, on some items I like to search by price. For me, it would be helpful if that function were to sort by Price + the Shipping charge. When I buy something I like to look at what the total cost is to me, not just the item list price.