edit: after doing some research it seems that the WD mybook series seem to be the most popular here. I will probably go with either a 500 or 750 GB one. Do I need to get the version that has the firewire connection? how much faster would it be for transfering? are there any other pros/cons? Also, this is will be my first extarnal HD so will I have any issues with keeping my music/movies on there and keeping the HD connected so that I can still play music through itunes and such on a regular basis? Is this simply a plug and play type deal? sorry for all of the questions.