don't get the 440. we had about 100 of them, 90+% of which failed within 18 months.
I have had no problems with the 5 or so I have running here.....luck of the draw I guess - which applies to pretty much every component part.
the 333's, on the other hand, are still going strong.
I must admit the 333 I have feels just as quick as the 440's - all have 1GB ram which helps enormously.
in general though, they're a pretty slow machine. the IDE controller doesn't help either.
I would concur with the idea of getting a SCSI card - all my Sun boxes have SCSI cards - only about £30 from eBay for a reasonable one - makes all the difference - the U10 with 440/1GB/72GB SCSI doesn't feel much slower than my U60 Dual 450/2GB/72GB SCSI on desktop tasks...certainly faster than it should given it's age :-)
Cheer