i've had a WD 160GB SATA
for about a year now and have been very pleased...it's fast and extremely quiet (never hear it spin up). one of the big reasons i chose it over another brand at the time is that it was one of the few drives to come with a 3-year warranty. it seems like the warranty periods on HDs can vary even within a brand...some WD's have 3 years, while others are 1 year...probably the same with other brands as well. in the end, i'd say they're all about the same...just have to hope you get a good drive (which most are).