your budget and where are you.
id first get the 3450
id get the asus board
id get something from xfx, corsair, seasonic, and other antec units
id get a 6870 if you can find one
thanks for reply why 3450 and also which of the two power supplies mentioned which is better and lastly i think that there is not a hell of performance difference between the two http://www.anandtech.com/bench/Product/540?vs=543