I've been trying to research what the best third-party SSD upgrade options are out there for my Mid 2010 27" iMac. From what I can gather the OCZ Vertex 4 and Samsung 830 are the top two drives... My questions are: Which is better? Anyone have personal experience with either of these drives? Does a capacity of 256GB or 512GB make any difference to SSD performance? I look forward to receiving some feedback and hopefully making the right choice!