I want to get an external hardrive, It seems the ebst method would be to buy a normal HD, and put it in a case. How hard is this method? IM pretty good with computers so IM sure It would be pretty basic. I think i want to use this harddrive http://www.newegg.com/Product/Product.asp?Item=N82E16822154414 Where can I get the case? Does ti matter which brand case I use?