There's also the Zotac NM10-DTX WiFi which has 6 sata ports.

Have you considered the Xeon X3440 instead of the i7 or i5? The Xeon is cheaper than the i7 and includes HT and apparently works ok on P55 boards. It's a little slower which should make it easier to keep cool so less noise.

The Zotac NM10-DTX might be of interest. It's a Pineview Atom board with 6 SATA ports and RAID. I can't post links but there are interesting articles at linuxtech dot net and techpowerup dot com