Re: 1 TB notebook harddisk
1TB 2.5" hard disks are almost impossible to get in the market. Even if available, they will also be around 4.5k+.
There are no IDE 1TB 2.5" drives. SATA is your only option.
Good SATA casings cost a bit and might end up making it a bit more than a normal 2.5" external drive. If your only purpose is an external drive, it doesn't make much sense.