OS X supposedly still supports SCSI. Long as you get a card that it has drivers for, it should be fine. I've seen a few cards at http://eshop.macsales.com/Search/Search.cfm?Ntt=SCSI%20controller&Ntk=Primary&N=0&Ns=P_Popularity|1 though those are very expensive, they will work inside Mac Pro's so should work in a Hackintosh as long as you get one that matches your PCI slots.

It's also a question of finding which chipsets OS X has drivers for. It looks like there are drivers in 10.4, but that's PPC. http://reviews.cnet.com/8301-13727_7-10334774-263.html says to remove certain conflicting drivers under /System/Library/Extensions.

Looking there, I see these two under Lion

drwxr-xr-x 3 root wheel 102 Jun 18 2011 IOSCSIArchitectureModelFamily.kext/

drwxr-xr-x 3 root wheel 102 Jun 18 2011 IOSCSIParallelFamily.kext/

And also this, which is one of the Atto SCSI cards: ATTOExpressPCI4.kext

So look in your kext folder and see if you can find another card.

Running this command gives a ton of matches, but most of them are false (i.e. using USB devices under as SCSI), but some look like they might be SCSI cards. So take a look at those and see if you own one, or can find one cheap:

Some more discussions: https://discussions.apple.com/thread/3632202?start=0&tstart=0