I got the 2011 base 13". I wanted to get the Intel 510 but it had so many problems associated with it. I looked at the Vertex 3: same. I got the SATA II Intel 320 and felt good until I read there was a firmware bug. I updated the firmware. My drive is working, everything is ok, but I am envious of the SATA III crowd. I wish I took a chance!
Best is probably Samsung 470, or Intel 320, or older Intel X-25M.
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Regarding speed in editing, sure, SATA III it will be twice as fast. Maybe you can't render that quickly. In my work, audio recording, there is no processor bottle neck. If I could be writing twice as fast than I could record more tracks live. I believe any programs that use disk caches would benefit.