The USB 3.0 Western Digital My Passport Air is the best looking portable harddisk to complement the design of your MacBook Air/Pro. Two different capacities are available, the 500GB is retailing for S$129 and the 1TB is retailing for S$219.
The enclosure is made up of anodised aluminium and it measures (length x width x depth) 112mm x 83mm x 11mm and weighs 160g. It is meant to be used with a Mac and hence it comes pre-formatted in HFS+ Journaled.