I picked up a 13" Late 2011 MBP with 10.8.5 from work for $400 and am looking to put a SSD in it. I was planning to get a Samsung SSD but not sure which model I should get. 840 or the 850? EVO or Pro? I'm planning to install Yosemite so was going to make a bootable Yosemite flash drive before I switch drives. Any tips I should know about?
The 840 Evo has some performance issues, which was supposed to be fixed with a firmware update (but it didn't seem to fix all 840 Evos with the issue), so I'd stick with the 850 Evo or even a smaller 840 Pro.
EDIT: I wouldn't go with Crucial because they use the SandForce controller, and everyone knows that the SF controllers compress writes, which makes its performance suck in benchmarks and write-intensive operations. But you probably wouldn't notice a difference in reality.