what are you going to be using the pc for? you should decide what processor fits your needs within your budget and go from there.
if you wont be gaming and are going to be doing basic office stuff heres a good option: http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.834859
another option with a significantly faster cpu and slightly weaker graphics: i5 2400 and z68 mobohttp://www.newegg.com/Product/Product.aspx?Item=N82E16819115074
if you really plan on not buying a graphics card and gaming then go with the amd build in my opinion. if you think you might possibly buy a graphics card and game or you do any cpu intensive tasks go for the i5 2400 option. it is much much faster