Wait a bit and get the soon to be released Asus E35MI-I Deluxe
I too am building another HTPC and it's going into a bedroom. I'm going to try to make it completely passive, but we'll see. I'm eagerly awaiting this fusion board to come out.
Edit- just in case you weren't aware, a PCIe-1x card works just fine in a PCIe-16x, 8x, or 4x slot.