How much are you running a week? I think that makes a ton of difference. Kind of like golfing. If you're a 20 handicap then a great set of clubs isn't going to make you a 5 handicap. If you are running 5 miles a week I don't think $150 pair of shoes will really make much of a difference. Unless you are wearing something that is completely wrong for your feet then you could potentially hurt yourself (back and foot problems specifically).
I do 3 days a week between 3 and 5 miles (usually) per outing.
