BUYING A MB FOR AMD 1.1GHZ &256X2 RDRAM

HI,
I AM BUILDING A SYSTEM FOR A CLIENT AND NEED TO SELECT A MB THAT WILL SUPPORT AN AMD 1.1GHZ CPU OR LARGER. ALSO 5PCI SLOTS, ULTRA DMA ATA 100 FACTOR AS WELL AS 512K TOTAL RDRAM 256K X 2. ALSO NEEDS TO WORK WITH WIN 2000 PROFESSIONAL. I HAVE HEARD ABIT AND ASUS ARE TWO GOOD BOARDS TO START WITH. I HAVE GONE TO ASUS SITE BUT SUPPORT IS LIMITED. ANY HELP IS APPRECIATED.
mARK