given the increase in HDD failure rate. I would suggest to buy two 500Gb HDDs. cost would be around 5k for two and a difference of 500 bucks won't hurt!!!
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My first blogspace: http://desiibond.blogspot.com
^^dude. it's a HDD, not a GPU. If you get Western Digital Green series HDDs, they will take much lower power than his existing dual HDDs.
btw, an always on HDD takes around 7 to 12 watts of power. which is totally negligible. I even had 4 -5 HDD running in my old machine sometimes which had a 450W PSU.
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Western digital is fairly reliable. But cant say that about Seagate now. So WD green/blue/black just take your pick. Plus WD has 5 years warranty and Seagate only 3!