Thinking of putting a SSD drive into my 2011iMac. Im not comfortable cracking open my iMac, a local PC repair shop will charge me $160 for install and I can bring in my own SSD. Is 250 GB SSD big enough? My current 1TB HD is only using 300 GB including iTunes. Is the $300 ($160 for install and $140 for the SSD) upgrade worth it? Will I be able to make a fusion drive using the SSD for the OS and the other HD for everything else? As far as SSDs go, what is the difference/benefits between Samsung EVO/Pro SSDs?