Chad Poindexter wrote an answer about Western Mountaineering Versalite Sleeping Bag: 10 Degree Down on October 12, 2013
Ryan, that is incorrect, the regular is 6' and the long is 6'6", so they are not the same length. Backcountry.com has the specs listed wrong. (I'll notify them.)
To the OP, I would suggest going with the long. Being a little over 6' means you will be stretching the bag out too much, and will compress some of the insulation around the head and feet, which is not ideal. The long version is what you need.