I'm in my third pair of shoes, lol.  Started out in some old New Balance 993's, then went to a store and he sold me on some Mizuno's that supposedly would be perfect for me.  Initially they were, but my feet and knees began to hurt.  Went to a different place and he suggested a shoe with a little more cushion.  Now I run in Nike Pegasus and the foot pain is gone and the knees get a little sore after my runs, but is gone by the next day.