Internal or external? How serious are you about video (enough to get by or everything there is)? What kind of files types are you leaning to (.mpg, .vob, .mp4, .avi )
Currently, with about 9,000 .vob video files and they are taking 1.5tb space. I use a dual 1tb drives in a single external enclosure (Cavalry 2tb) configured as one huge drive (and a second Cavalry 2tg for identical backup, and two 1tb Seagate externals for a third "just in case").
I've always been partial to Seagate brand drives since my dealings with exclusively SCSI drives way back when however the manufacturing techniques and locations are now almost the same. To me, it no longer matters much more than an emotional attachment or brand loyalty.