Depend what you want...
1. desktop HD size or notebook HD size?
2. What are you use for?
3. access time of your HD (desktop HD noramlly the speed wil faster than other... desktop.SATA 7,200 rpm.... notebook.ATA 5,400 rpm)
4. Do you mind to use additional power supply? Otherwise, you need to use UDB2.0 port to connect and power supply your Portable HD
I spend $810 to have buaffalo 320GB external HD.. combo connect (IEEE1394 / USB2.0)... it is very very good for me... if you budget $700... you can get buffalo 160GB.. either combo connect or USB2.0 only (cheaper than combo)..
Enjoy!!
2008-02-29 10:05:44 補充:
My Portable HD use external power supply (come with the HD)