Hi
If you are sure that from the router you can reach the internet but not from the network, then check these:
1- Add a default route on your router:
Router(config)#ip route 0.0.0.0 0.0.0.0 ppp 1
2- I have no idea about your DNS settings, so i would look on the DNS you have configured on your DHCP scope.
3- Test: try to ping
www.google.com from your PC, and try nslookup
www.google.comOther than that, your configuration looks fine (after removing your private info from :) )
Good Luck !!!