Rather than upgrade I've decided to turbo charge my iMac with an SSD in place of the Superdrive. There are plenty of threads on here about the upgrade procedure (most quite old now) but I was wondering if people had an opinion on which SSD suits my iMac best, bearing in mind I believe it has 3.0GB SATA connection in the optical bay. I will be going for a 256GB one. I've read horror stories about OCZ reliability, the Crucial M4 seems good for the price if you update the firmware. Is it worth paying out any more for a faster one, and would I even notice any difference with 'only' a 3.0GB SATA connection? Any help appreciated.