Yes you are right it is a good motherboard. According to this web site
http://www.linuxtested.com/results_servera.html
it should work.
Buying the cds from linux central is not going to make a bit of difference. Unless you have your hart set on Mankrade I would try another disto. I like Suse and RedHat.
Also have you tried making a bootable floppy to start the install or try re-downloading the first cd and reburning the cd.
Buying the cd from a third party is not going to do you any good. I don't like buying cd's from third parties because they are just profiting on others work. I by a distro from the original supplier, only after I have tried for a while first. I do this just because it is the right think to do. Enough preaching.