If you are doing a complete Flush. I would definitely go with the G-05. Very easy to find if needed. Excellent coolant.
Yes Mix with Distilled H20. Since it really never gets extremely cold here during the winter. I mix 60/40-->Water cools better then coolant.
Like Burla stated above-->Give RMI-25 a look see! Gives that cooling system a bit of added protection.
RMI25 - Engine Coolant System
Used it in my 01 7.3L Powerstroke along with a spin on coolant filter. The stock water pump life span was 120K miles. After 298K miles at the time i sold her the stock water pump was still in place working perfect with zero leaks. Now I use it in my Ram as well as the other 3 family autos.