The WD Cavier Black 1TB, Samsung Spinpoint F3 1TB and Seagate Barracuda 7200.12 1TB are all very similar in speed. One will be slightly faster in one area while another may have an advantage in another. The best "bang for your buck" drive used to be the Samsung Spinpoint F3. Very fast and they have a reputation of reliability. It was also the cheapest generally.
However, recent flooding in Thailand where all the companies have their factories have made prices skyrocket. This is expected to last through the whole year of 2012. So my advice to you is to find the cheapest of the 3. Amazon and newegg are generally the best places to look for the best deals.