I currently have a Hitachi 7K3000 3TB (purchased for much less than currently listed, thankfully) and a WD EZRX 3TB Green drive that is about a month old. The Hitachi is a bit faster on sustained transfers, and a bit snappier overall, but it runs warmer and louder (both idle spin sound and read/writes). The WD is extremely quiet, which is important for me since its a 24/7 HTPC/media server. I use an SSD for boot/apps, so speed isn't terribly critical for me. For my purposes of media delivery, the WD is my preferred drive. If an SSD wasn't in the picture and it was the primary drive, I'd definitely choose the Hitachi. Not as quiet, but certainly quieter than my 1TB WD Black drive, and nearly as fast too.
The older WD Green drives were not stellar in terms of reliability. I had a 2TB EARS drive fail after less than a year of light use, but the newer lines seem to be a bit better. Only time will tell. You can always look at Newegg's reviews, but take those with a grain of salt, since sometimes there is a positive feedback system, where a few people have a bad experience and it snowballs and everyone with an issue then reports it to be part of the crowd. It seems like the overall egg ratings are about the same for all the newer high capacity drives. I do like that the new WD Greens at least have a 2 year warranty, vs. Seagate's 1 yr.