Recomend me a hard drive

Well it seems my hard drive is on the fritz, and I need to get a new one.What should i look for when shopping for a hard drive? I'm looking to spend about $50, and need <500Gb. My current drive tells me it's a 500Gb ATA drive.

and yes, space is limited so a chair won't do.

I'm fond of the Samsung Spinpoints myself. They're not well-tuned to be server drives, but work very nicely in desktops, benching well on single-user applications. They're also extremely quiet, and run nice and cool.

You probably won't be too upset with anything you'd buy, but I happen to like the Samsungs.