Best Mobile HD?

I want to buy the Portable HD of 320GB or 500GB. Any one can advise me which HD is the best. Segate or WD or any other else.

And excepted price.

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Using WD Elements 320GB. Good reliable drive with good data transfer speed.

Check the galaxy site for price, I hear bad things about Seagate and have personal great experience with Western Digital, plus WD is cheaper!