I had been bugging Buffalo for awhile to get me either the TeraStation Pro II or Live so that I could see how the switch to a Marvell-based NAS platform affected performance. Looks like it helps quite a bit.
Check out the NAS Charts, which include data for 100, 1000 and 1000 w/ 4k jumbo LAN connections and RAID 0, 5 and 10 modes. Enjoy!