Hi
I'm a very heavy runner, 20st+, I was told to visit a running shop, which I did and they were really good, I was advised to try on the tread mill New Balance, Brooks and Asics. Nike I was told tend to be for the lighter runner and can be very good but don't last with my weight.
The key to running overweight is to use incerts and to change your trainers more regulary than normal.
I over Pronate very slightly, and I chosen Asics Nimbus 9 and Brooks GTS.
Both have so far been very good.
Peter