Newegg has Corsair Carbide Series 500R ATX Mid Tower Computer Case (White) on sale for $119.99 - $30 promo code AFNJ101 - $20 Rebate = $69.99. Shipping is free.
http://www.newegg.com/Product/Product.aspx?SID=Il6odGo3EeKOph7tkVD5Sg9674_cK.P3_0_0_0&AID=10440897&PID=1225267&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-cables-_-na-_-na&Item=N82E16811139010
There’s room for eight PCI-E cards of up to 316mm in length.