Hi, yeah I corrected my earlier post.
Here is something to consider:http://www.cpu-upgrade.com/mb-ASUS/M2N68-LA_%28Narra3-GL8E%29.html
read the comments section, I know it is for a different revision of your motherboard
but it illustrates that newer CPU's will work in some systems with a bios update, or show up as unknown CPU and still run fine. Buy a athlon II locally and if it doesn't boot return it, just make sure about their policy.