If the data's the most important part, theoretically, you could purchase another Comstar case, swap the new drives with your old ones, and get at all your old data with the new enclosure containing the working RAID controller.
While it would void the warranty on both the new and the old enclosures, it would be much better and cheaper than taking your hard drives to an expensive data recovery center.
I can't really add much more than what you've already tried. And I take it that because the drives are set up in Raid 0, you can't just try installing them in another enclosure from a different manufacturer? Or have you already tried this? My hope is that if your drive is a Comstar drive, they used a cheap controller, in which case the computer might've been responsible for the computing, and in which case, you might be able to recover the drive by connecting the drives using Raid 0 in a different enclosure.
At this point, this is my best suggestion. Otherwise, you're looking at exactly what Tanarus suggested - specialized data recovery services.
In the future, I have two pieces of advice. One, avoid Raid 0 setups. If one drive dies, both are dead. Use Raid 1 instead so that your data is backed up (yes, you cut your available space in half, but at least your covered in the event that one drive dies). And two, avoid Comstar hard drives, just stay far far away from them, and feel free to tell all your friends to avoid them.
