This external hard disk drive maybe is not everyone´s liking or price level.
If it is the price or the capacity or both then you can buy a model with less capacity:
LaCie Porsche Design P´9220 Mobile Drive 500 GB (6,4 cm (2,5 Zoll), USB 3.0), about 65 EUR.
LaCie Porsche Design P´9220 Mobile Drive 1 TB (6,4 cm (2,5 Zoll), USB 3.0), about 100 EUR.
If you don´t like the design because of the sharp edges or the weight then I recommend:
WD My Passport external Harddisk 1 TB (6,4 cm (2,5 Zoll), USB 3.0), colour: silver
this one I have since 2 years, in the meantime Western Digital has offered a newer model:
WD My Passport Ultra external Harddisk 2 TB (6,4 cm (2,5 Zoll), USB 3.0), colours: black, blue, red or titanium
Get it with a capacity size of 500 MB (about 50 EUR), 1 TB (about 65 EUR) or 2 TB (about 110 EUR).