I'm buying a laptop(asus n10j-a1) and I will be upgrading the hard drive I'm looking between the :

western digital: WD3200BJKT 320GB 7200RPM 16MB cache
western digital: WD5000BEVT 500GB 5400RPM 8MB cache

My basic usage will be: (~20-30GB for windowshotoshop..) the rest will be ubuntu for storing my photos from my D80

The diffrence in price is about 40$ for the 270GB more
I was wondering which I should go for?