Hello. You don't need fast motherboard's RAMs because you don't need fast RAMs lol. It almost doesn't matter is it 1600 Mhz or over. So save money and pick mid budget motherboard and 1600 Mhz RAMs.
These RAMs are sooo awesome for nice price - http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428