Before buying shoes online, I would suggest ensuring that you're wearing the right size shoe. When I visited the ASICS store in New York City, I was stunned to learn that I should have been wearing a half-size larger shoe, narrow.
Not every shoe comes in widths, and I have come to love the ASICS 2100 series, including these.  They are at least as supportive, for me, as the Gel Kayano, a more expensive shoe, and is lighter. It is my experience that more shoe weight, when running longer distances, can be associated with knee pain.
But what's best about these is that, because they come in black, I can wear them for all but the most formal occasions!