If you are looking for fancy stuff you can look at any of the Gigabyte's Ultra series. I like to get my hands on GA-8KNXP Ultra (Intel 875P Chipset)for example!!! It has onb SCSI, ATA133 Raid, and SATA.
http://tw.giga-byte.com/MotherBoard/Products/Products_NewProduct_List.htmI personally really like any of the Intel 865 and 875 Chipsets.
if you are looking for SATA Raid and not IDE you can buy any motherboard and use seperate PCI SATA Raid. I just got Promise S150 TX4 SATA raid controller today and i'm testing it now (So far looks really good at $175 CAD).
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if it has to be onboard, motherboards with ICH5-R in south-bridge (optional i865 and i875 Intel Chipsets) will support SATA raid.