I have ankle and knee problem from old injuries and the Nike Shox don?t help much.
I own a pair that cost $245 USD, and I don't notice much different in them when compare to my regular runners at less than 1/2 the price. The Shox shoes are very comfortable & ultra light, however it doesn?t have more support than other decent running shoes.
The best money I found is a good pair of insole at about $20-35 to go with the middle of the road shoes. There are runners that can be had for as little as $50-80 that is well balance & light weight, and with good fitting combine with insole is the way to go.