I'm mezmerized over the same issue. I was going to go 939 and then I saw so much support for AM2.
Please see this wiki
http://en.wikipedia.org/wiki/Socket_M2 and tell me if you still feel the same way.
It states that am2 will handle am3 cpu but not the other way around.
When will am3 cpu come out?
I"m also wondering what north bridge to go with. Light game mostly home video creation/editing and photo work. Lots of cpu load there.
Still like am2 ?