Well I seriously doubt that you will be able to get anything back. You say your project file was also on that drive. That is why it is always important to keep your project file on a completely separate drive then your media. That way if the media drive goes out you can recapture.
Don't let technology get in the way of your creativity!
Did you have the (2) 750GB drives RAIDed as RAID 0 with DiskUtility setup?
If so, and you haven't done anything to either drive ; simply choose those two drives again, in DiskUtils RAID setup, trying to keep them in original order. If there is no other problem than loosing the RAID setup, it should go back together.