Westen Digital WD1600 AAJS- 160GB, SATA II, 7200 RPM, good performance, but availability is low- Rs 2500
Samsung HD160JJ- 160GB, SATA II, 7200 RPM, mediocre performance, availability is high-RS 2400
Don't know much about Seagate drives though- their rate of failure is higher than most drives, that's what I've heard.