well, these days since Quantum and Maxtor just merged, you may get a Quantum hard drive in a maxtor box. I've seen that happen frequently recently.
The IBM Drives especially the 60GXP and 75GXP are having a lot of problems right now, and reports are coming in of them dropping like flys.
Western digital are good drives, no complaints there.
and as for the Seagates........I love mine. It's a lot faster in benchmarks than my Maxtor, and it's almost totally silent. Can't go wrong with those. They've even got a metal protective plate over the electronics!