Here's my latest round of NAS tests, you can clearly see why I prefer the Synology.

It's interesting how much performance difference there is between the DNS-321 and DNS-323, I thought it was less before...
Synology DS209 Gigabit, no jumbo frames, RAID-1 EXT3 1.5TB Seagate 5400 RPM Drives
Running a 2000MB file write on drive I: once...
------------------------------
Average (W): 31.87 MB/sec
------------------------------
Running a 2000MB file read on drive I: once...
------------------------------
Average (R): 62.97 MB/sec
------------------------------
DNS-323 Gigabit, no jumbo frames, single EXT3 1.5TB Hitachi 5400 RPM Drive
Running a 2000MB file write on drive j: once...
------------------------------
Average (W): 13.03 MB/sec
------------------------------
Running a 2000MB file read on drive j: once...
------------------------------
Average (R): 17.3 MB/sec
------------------------------
DNS-321 Gigabit, no jumbo frames, single EXT3 1.5TB Hitachi 5400 RPM Drive
Running a 2000MB file write on drive K: once...
------------------------------
Average (W): 9.34 MB/sec
------------------------------
Running a 2000MB file read on drive K: once...
------------------------------
Average (R): 11.81 MB/sec
------------------------------