For a CPU I would go for
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808&cm_re=955-_-19-103-808-_-Product
And for a Motherboard I would go for either http://www.newegg.com/Product/Product.aspx?Item=N82E16813131398&cm_re=M4A785TD-V-_-13-131-398-_-Product
Or a slighty more expensive one http://www.newegg.com/Product/Product.aspx?Item=N82E16813131366&cm_re=M4A78T-E-_-13-131-366-_-Product
Which comes to a $258 for the first motherboard and processer.
Or $277 or something for the second.
You do realise you need more parts if you were to get the full use out of this?