Cool. Fair enough. You may owe it to yourself to take a quick look at the Promise RAID that Apple now ships. It has active/active RAID controllers and would provide 4Gb FC connectivity instead of SCSI.
If you need to find a backup solution, take a peek at the white paper on my site. I should have a new version coming out soon, which outlines the new version of PresSTORE.
http://www.district13computing.com/projects.html
Feel free to ask if you have any questions. Putting in a new server is a big task. Be sure you're considering how you want to design your data storage, so that permissions are easy to follow and that you are leveraging any available Directory Services you have at your disposal.
Good luck!
Michael