if you plan on upgrading your processor in the future, socket 1366 is the way to go.
gulftown (intels up comming 6 core) is going to be on that.
another reason not to get a p55 foxconn board
http://www.anandtech.com/mb/showdoc.aspx?i=3661
and you'll be able to get away with a quality 550w psu, even if you crossfire it.