if you can I would try to get one a hair shorter than rons, I have been shooting his for a few years and have noticed that they tend to stretch out a little to much for the final length.
The brace height is suggested to be no lower than 7" up to 7.1/2" from string to the low spot on the grip. When you first string your bow it may be higher than that but DO NOT untwist the string to the suggested 7". The string will stretch after you shoot the bow for awhile at which time you can adjust it to the desired height. If you untwist the string initially to lower the brace it may slip through itself and come apart