Here is the one I have it works well I have only had it for 2 weeks now I have already dropped it a couple of times which I don't recommend you try but it still runs fine. The only thing I don't like about it is you have to plug it in to get power plus it didn't come with and sata cable luckily I had one laying around.
http://www.newegg.com/Product/Product.aspx?Item=N82E16822101132
Buying a hard drive and putting it in a enclosure is the same as buying and external hard drive. External hard drives are nothing but a regular hard drive in a enclosure so it is really the same thing.