Check the mainboard maker's web site.
I have an Asus A8V mainboard (Socket 939), and it has all sorts of drivers
for Win98SE. Win98 Gold may be problematic; if memory serves, SE was
required if you needed to use WDM drivers.
If you insist on using Win98, and don't have SE, perhaps you can turn up an
install CD or the upgrade CD. (I saw a copy of the Gold-to-SE upgrade CD at
a computer show a few weeks ago, for 20 US$. There was even a slight chance
that it wasn't a pirate copy.)
I've been running XP for about two years, and recommend it over Win98. If
you don't need to boot in a real DOS mode, XP may be a worthwhile upgrade.
As for hard disk reviews, a central source is
www.storagereview.com. I'm not
competent to judge their expertise, but their database is huge.
I've had good luck with Western Digital drives. I once had a Maxtor drive
that didn't work with an HPT366 IDE controller on a Soyo 6BA+IV mainboard,
but that probably says more about the Highpoint controller than the Maxtor
drive. Seagate now offers the longest warranties in the market (5 years,
instead of 1 or 3), and I believe that they were first to market with drives
that natively supported SATA. I have an IBM (now Hitachi) 60 GB Deskstar
drive in my desktop PC at work, and it seems to be fast, quiet, and
reliable.
My own drives at the moment are a pair of WD1600JD (SATA) in Raid 0. I
haven't been using them long enough to demonstrate reliability (or the lack
of it), but they're reasonably quiet.
Address scrambled. Replace nkbob with bobkn.