Just wanted to vouch for the Newtons... I was skeptical at first, particularly because of the price, but I tried them and liked them. I got 568 miles out of my first pair and am at the 450 mile mark on my second.
As you probably already know, everybody has a different footfall, stride, and gate, not to mention pronation and all the other technical terms, so what works for me does not necessarily translate into somthing that will work for anyone else. But I found that the nubs on the bottom of the shoe encouraged me to run more "mid-foot", which in turn gave me a tad bit more speed without increasing the amount of effort. There are various dynamics involved and it took me many miles to get used to how to run in them. In the end I find that for long distances I will run more "flat-foot" vs "mid-foot", but when looking for a bit of speed, as soon as I let myself go "mid-foot" I have a nice boost of speed. Unfortunately I'm old enough that I can't keep the speed up for extended miles, but it does work.
The bottom line is, try the Newtons, but give yourself some time to learn how they feel and how to run in them.
Enjoy!
-bill