I suggest Maxter or Lacie. Both are extremely good. Lacie is sleek external hardisk which doesn't require power supply ( costlier for same GB) where as Maxter I got 500 GB for abt 95€ (when euro was < 60). so, you could get Maxter in your budget for your size I hope. good luck.
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A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
^I've seen casings for laptop disks only,but i guess u can get them for normal ones too.
But, AFAIK, you need to have external power supply to use hdd through usb.
And AFAICR, i read somewhere saying laptop hdd's dont need it.
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Do what you will; but not because you must. -- Zen Quote