You might want to grab that ebay item with both the mobo and WHS V1 (great price). I would recommend Antec 300 case (best features at the pricepoint) with space to route all those un-used power cables. And don’t cut corners on the power supply – really good ones are often discounted and worth a few extra bucks (see link for a suggestion).
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027
Enjoy,
Mike
