Whichever drive is available in the capacity you want for the least amount of money. I have used, at some point, hard drives from all the major brands. I used them for years and years and have had a grand total of one go bad and need replacement. It's all luck, so IMO it really doesn't matter what brand you buy. If reliablility is such a big concern, you wouldn't really be looking at IDE in the first place. You'd be getting SCSI.
\Dan