I was reading through a few other blogs while on vacation and found this tool being mentioned.
http://dwestbrook.net/projects/ham/dBCalc/ written by David, KJ4IZW.
A very slick calculator for determining needed power output for completing a JT65 qso.
If you are into the digital modes, it is worth checking out as it reinforces what you really need to be running for power to make JT65 qsos.