I will admit that the 6.5 has some fantastic ballistics and is a very attractive cartridge. If one is handloading then there wont be a whole lot of difference between the 6.8 and 6.5. heck get both if you have the means!!
my arguement only applies towards a combat cartridge use, and becomes largely irrelavant if one never plans on using it outside of a range or hunting or competition.
I'm just so darn practical sometimes it's hard for me to see that less practical side of things :P