Some time ago, I changed my IWill 2935UW SCSI card for the latest 2936UW model. This change was partially due to cure a problem with the DVD drive, which was subsequently found to be due to the Ce-Quadrat CD-Writer software.
I recommend you get a card with both a 68 pin and a 50-pin internal socket, plus an external mini D socket (or HD), which will require an additional cable, (50 pin high density to Centronics) for an external scanner. This will prevent you plugging in a printer lead by mistake and destroying your SCSI card. It's easily done. I know, I've done it twice to a dedicated flatbed scanner SCSI card, before I purchased the Iwill 2936UW.
On a previous configuration, I fitted an IDE controller card. By disabling the IDE controller on the motherboard and swapping the controller cards over, I could boot with C: (SCSI) and other, slower IDE drives as D: upwards. Without the separate IDE card, the SCSI disk came after all my IDE drives. My latest ASUS A7V motherboard BIOS enables me to boot from SCSI, IDE and much more!
Unfortunately the drivers for IWill SCSI cards have not been updated for years, and do not include WinXP. Hence, to get SCSI capability back onto my system I had to revert back to an earlier Adaptec AHA2930U2, Ultra2 SCSI controller card, with downloaded XP drivers and everything now works. A flash BIOS upgrade has also resulted in faster operation of my new Canoscan 4000 film scanner.
Many scanners are supplied with an Adaptec SCSI card, but this is usually a cheap, single device, low specification card. The Minolta range of 35mm scanners are an exception as the SCSI card is not included, giving you more choice on your SCSI setup.
For advice on SCSI cabling with a SCSI hard disk and CD's click the underlined text above.