No worries. Given that you had to get one urgently I don't think there was much choice. That's why I suggested getting two different ones and making a redundant backup.
Remember that there are two parts to a "hard drive": the drive itself, and the enclosure. On the drive itself, it seem to depend more on the specific model than the manufacturer. They all (all....? three manufacturers left? Or only two?) make drives in different grades. newegg is a good place to vet a prospective drive purchase, after looking at a bunch you will get an idea of which drives are a better bet.
On the enclosure, I'd recommend replacing the cheap one with a good quality one. I really like the Firmtek miniSwap if you want to use 2.5" drives. OWC is a popular choice for Mac users.