Re: Which case?
Don't worry. A lot of threads apparently got deleted. I've noticed some of mine are gone too. Must've been that transition to the new server as David posted.
The Antec case is very similar to the Coolermaster, but it may be build a little better and comes with that 450 watt powers supply which is adequate for you. I would get that one. It may cost more, but you get more for your money.
As for the motherboard, yes it does have an integrated RAID system. You have the option of setting up RAID for your IDE drives or SATA drives.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?