Stoopid noobie here, just joined, never installed memory. This has sort of been discussed, just wanna make sure I'm making the right choice. I have a 27" Mid 2011 2.7GHz Core i5 with 8GB of memory. I want to purchase the max memory which is 8GB more for a total of 16, right? [On some site I saw a table that showed something like actual = 16GB and another column that indicated the maximum was 32kGB, which totally confused me.] I looked at OWC and Crucial. Crucial is $45 and OWC $56. Are these the best choices and, if so, should I go with Crucial since they're cheaper? Thanks!