I don't think the 2940 is U2W only UW 50 pin (Same card I have ;-)
However, is the cost increase relly going to be worth it in your situation? UDMA can get just about as fast as the 2940 and considering whenever you access a different devide (cd, zip, etc..) that will be the limiting speed anyway...
Just a thought. I prefer SCSI myself because of configuration - it's incredibly simple and only takes one pci slot/irq. :-)
I call it "No-Pants Wonderday," but it turns out the police just call it "Thursday." Go figure.