Buy the drive and case seperately and put them together. Save yourself a few bucks, and know the drive you buy has a 5 year warranty, then pick one that outputs less heat based on reviews from Tom's Hardware hard drive benchmark charts.
www.tomshardware.comI have had 2-3 external hard drives around constantly for years, and took a 1tb drive to Edmonton for my training then to Afghanistan (only used indoors while air conditioned while overseas). Still works fine. Have always had good results with Vantec Nexstar enclosures. Passively cooled with an entirely aluminum casing.
http://www.canadacomputers.com/index.php?do=ShowProduct&cmd=pd&pid=021590&cid=HDE.700The WD drives are prettier, but tend to cost more for nothing.