Question : Opinion - best portable hard drive to backup SBS

Hi People.

I wanted your opinion on which portable hard drive to get to backup SBS 2003.

My Preferences:
Capacity: 500GB
Under 100£
Power: USB (I do not want a Separate Power Adapter)
Usage: For backup SBS purposes.
Desirable: Any backup software included.

Answer : Opinion - best portable hard drive to backup SBS

My correction, you can. sorry.  I have a 500GB Seagate FreeAgent Pro plugged into my Macbook now.  It uses 2 USB ports. works fine.   I'd go with that.