I am looking to supplement my measly 80GB HDD. Whats the best value for money size category I should be looking at right about now. 320 GB, 500 GB or 640 GB? Which of the three have a better Paisa per MB ratio? My main storage need is for all the photos and videos I take. I dont really need speed. Should I go for a 32MB buffer or 16MB? Which brand/line should I be looking at. Samsung/ Western Digital/ Seagate? Are these "green" lines worth the premium they demand. Do they actually result in any real energy savings? My budget varies between 3-5K. --- In continuation to the question, After I get the new HDD should I: a> Remove the Old HDD and use it as portable storage. Keeping it inside will only hamper airflow. b> Retain both drives internally.