Thecus N5200 (Score 1)

I have Thecus N5200BR with 5 x 1TB WD Greenpower drives in a RAID 5 array. It uses a Linux based software raid but has a nice, relatively beefy CPU to keep speeds up. Supports Gigabit ethernet with jumbo frames. I believe you can couple the LAN and WAN ports to double your network bandwidth. You can also open it up and upgrade the RAM if you're adventurous enough. It supports the major file sharing services and I've had no problem with it on my home network (Vista 64 and 32, XP, OS X Leopard, OS X Tiger, Ubuntu). Works beautifully out the box, but you can install various "modules" as well to give you shell access, media servers, etc. All in all a fantastic high performance NAS.