I saw the same post in the Bazaar section first and replied there. Repeating my reply here as this is a more appropriate section :
From personal experience and from reading about other people's experiences, I believe Seagate is the most reliable HDD brand. Maxtor's just about the worst, with Samsung and WD somewhere in between.
Kolkata price a few weeks ago : Seagate Barracuda 7200rpm PATA 80GB - 2650/-, 120GB - 3650/-. May have changed slightly now. I'll know for sure after I call my dealer tomorrow.