I have been to several seminars on coolants & inhibitors, and I still do not know which is the best.
Some things I do know; Glycol is not only for cold climates, it also raises the boiling point. Temperatures in the combustion chamber are high enough to cause boiling at the walls of cylinders & exhaust ports, this boiling causes pitting of the metal, a percentage of glycol in system stops this.
I don't know what Ford's latest coolants are like, but their previous inhibitors where useless.
Castrol's Glycol based coolant is used by most oil companies (rebadged) & seems to be quite good.
Tectaloy are an Adelaide based company & seem to have a good record & a large range of products. http://www.tectaloy.com/
Depending on how you use the vehicle; if you drive economically a glycol based concentrate will be fine, the type that one litre concentrate makes fifteen litres of coolant.
If you drive hard or own a turbo use a glycol based coolant to the ratio of 33% - 50%.
It is dificult to competely drain all the coolant from Ford blocks, if you can not drain 90% of the coolant maybe use a Glycol based coolant like Tectaloy Long Life Glycol http://www.tectaloy.com/products.htm
which you mix approx 50/50, eg cooling system holds 15L use 7.5L glycol coolant & 7.5L water.
That's my 2 cents worth.