Most power efficient 1TB 7200rpm drive?

[broona]

As title really, looking to upgrade from 2 320gb Seagate 7200.10's, and trying to get the most efficient drive I can without spending more than I need to.

 

[broona]

Maybe this drive? http://www.overclockers.co.uk/showproduct.php?prodid=HD-158-WD

yup

nice and quiet too, have one in my media centre

Thanks for the replies, but it's only a 5400rpm drive, and not a 7200rpm. TBH, I probably wouldn't notice the difference, but I'm currently using a 7200rpm drive, and didn't really want to 'downgrade' that speed.