Best 2TB for TiVo HD/Series3?

I'm considering three different drives to upgrade TiVo HD/Series3 units to 2TB: WD20EURS, WD20EURX, and WD20EZRX



Amazon has all three for similar prices, any recommedation for which I should use? Does it actually matter which one I choose?



Also, I plan to use wdidle3 to disable Intellipower regardless of which one I choose.