Dilemma! Which should i choose? I don't transfer large files like video, however, I do upload photos from SD card,... so which is better for me (as the price difference is not that significant) if pricing is disregarded: 160GB @ 5400rpm? 200GB @ 4200rpm? (USD$90 more) 160GB @ 7200rpm? (USD$135 more) Please let me know ASAP as I will be ordering in less than 10 hours!