Or just use this free calculator; http://http://www.tastybrew.com/calculators/priming.html
You choose from a list of styles,which when highlighted,give min-max co2 volumes. it'll recommend a voulume for gravity & temp,or you can change it to suit yourself in the "volumes of co2" box.
I use this thing, and always shoot for the middle of each style color for the carbing temp. That way, if the temperature fluctuates too high or low, it still stays within a reasonable carb level.
(I have a picture of this chart, but it's essentially the same thing as what's on this website) Force Carbonation Table