Definitely recommend IBM drives; my 34GXP 20GB (7200rpm UDMA/66, DPTA-372050) is damn quick and very quiet, and my (work) experience of 75GXP (15GB-75GB, UDMA/100) is good too. Generally I've found Maxtor good recently and Seagate good too if hot, but would steer well clear of WD (personal experience with them is VERY poor, over 10 years with several dozens of systems I've seen a failure on their drives every couple of months even though I've seen more systems with Seagate and IBM drives (0 and 1 failure, respectively, both including 300M and 500M discs still in service today, the latter single failure a 2G disc in a 7-disc RAID 4 years ago)).
Someone mentioned Quantum. I've not seen many but do sorely remember the time when their firmware corrupted data under Linux, OpenBSD (I think) and Solaris. Basically because WinXX didn't push the drives very hard, under WinXX the problem never showed up, but under several Unices people got corrupt data, and Quantum didn't acknowledge or fix the problem quickly. I think both their SCSI and IDE drives did it; I'm sorry I'm so vague right now. Since then I've only recommended Quantum in low-end Wintel boxes; their Bigfoot drives were seriously quiet a couple of years back so good for some desktops.
Of course that's just my 0.5c and I'm sure my experience has been quite different from others'.