Hi, have you sorted out this problem?
I have run into exactly the same issue.
At first, I could boot my macpro and get to RAID utility to create a RAID5 volume on OCZ vertex SSDs (4 of them).
I could even start installing MacOSX on the volume, but it failed in the middle.
After rebooting and trying re-installing, I started getting a gray hang-up screen all the time. Sometimes I can get to RAID utility, sometimes I get stuck before that. I think the RAID card is somehow flaky...
I gave up waiting for a response from Apple. Ended up RAIDing without the RAID card as the machine needed to go into production use. In the process of returning the card..
I still get good speeds though, 3 120gb RAID 0 750/650 read/writes.