Hi Seagate or western digital are the best. Use sata and try to get at least 10,000 RPM drive then your pc will really fly. Also look for 16mb cach on the hd... it will be advertised in the specs Good luck
SATA is better and also use the twelve pin if your mother board supports it for this really will help performance.
According to me SATA is way better hard disk, I am using it and so far i dont have any problem with it.
SATA is the next generation compared with IDE so normally it`s faster, whatever you choose the warranty is the most important thing.