My previous iMac 27" had a hard drive fail this week and I got a replacement (I guess they didn't want to wait for a replacement drive to come in, who knows). Problem is, this hard drive also makes the ticking noises, although not quite as loud or as frequent, and it also makes a louder whirring noise than I've heard on a Mac in a long time. So I'm a little bit skeptical about this hard drive as well, and I'm considering replacing it. What is a good option that will be quiet and reliable? I don't want to spend a lot of money, so solid state is probably not an option. That said, I don't need a ton of space, 500GB to 1TB would probably suffice (the current drive is the 1TB, it's the base level 27" iMac). Also, how much would I expect to pay to have this installed by an Apple authorized repair center? Thanks.