Having done three Mac SSD upgrades including one Crucial and one OCZ, my concern is now reliability. SSDs are not as bulletproof as hard drives. The Crucial is the only one that was has not yet given me any trouble. I had to replace the OCZ, the first one created so much data corruption that I had to restore the computer from backup on average once a day, the second OCZ seems ok however. The third drive, and I can't remember what that one was, has had a lot of crashes but they may not have been caused by the drive. Anyway, from my extremely limited experience, I'd get the Crucial out of fear that the price does in fact reflect quality.
In a Mac Pro, when it works an SSD definitely improves the performance, it's hard to go back to all the whirring and delays.