PCI ATA 133 RAID Card VS. PCI ATA 133 Controller Card

Hello,
I just bought a 300gb HD to put into my QS. I know I need to add another ATA card, but I noticed in stores there is a PCI ATA 133 RAID and a PCI ATA 133 Controller card.

What is the difference? The ATA 133 Raid card I saw is considerably cheaper. Can I use it to run my 300Gb drive as my startup drive (iDVD issues!)?

Thanks for your help.