[link|http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7169436885&category=4619&ssPageName=WDVW&rd=1|Here]. (Speaking of Sun, it looks like they got eBay's business from IBM. Hmmm.)
You'll probably need [link|http://hobbes.nmsu.edu/cgi-bin/h-viewer?sh=1&fname=/pub/os2/system/drivers/storage/danis506r173.zip|danis506] to install on that large a disk.
What's that you say?
Oh, "OS/2 is so 1995"? Well, maybe.
OK, if you don't want Warp, there's eCS but it's similar. It's [link|http://www.ecomstation.co.uk/html/prices.html|100 lbs] as an upgrade from Warp 4. Maybe a bit pricey as a play OS.
You've got Winders, OS X, and know Linux. What else is there? Well, yeah, there's always *BSD but I imagine it would have issues similar to what you encountered with Solaris.
Dunno. There aren't too many other OS choices.
Seriously, OS/2 would be a very good choice for that machine. It would fly on it. Warp 3 Connect was pretty snappy on a 486 with 64 MB of RAM.
HTH.
Cheers,
Scott.