99 to 62MB/s on the linked review. I'm only aware of the WD Green 1.5TB drives and Hitachi 2TB drives discussed here because I own eight of the greens (well have 5 as 3 are in RMA land since they died quickly) and six of the 2TB Hitachi's (all still well). Not a ton, but enough that I have a sense at this point.
Assuming you use decent (i.e. Intel) NIC's and a decent switch, 99MB/s isn't that hard to surpass over a LAN. If you directly attach the drives you are OK if you only plan to have direct access, and not simultaneous access from the network. While Greens are OK for simple read/write operations, the random access times, sequential reads, and more aggressive head parking are noticeable. If you do a big sequential read, you don't want to try doing a write, or a second read off the same disk. It depends on what the OP is after. Realistically, the difference in power consumption isn't going to be more than 2w so the "green" part of hard drives that are 11w parts is fairly moot.
Although the OP may not have mentioned RAID, by the time you fill up a 1.5 to 2TB drive you will think about how much data is on there, and quickly start looking at Raid 1/5/6. 2TB of data is worth keeping somewhat safe just because even backing up physical media takes time and effort that is worth more than the price of additional drives. Google (or search here) "WD TLER Raid" if you aren't familiar with why the newer Greens do not play nicely with raid.