Prices will drop eventually, so while it's not a practical upgrade at the moment, it's still a noteworthy price eventually.
Anyway, as all 2011 Macbook Pros use the same kind of memory, I can tell you easily by checking the specs of my modules that the specs you'll want two 1.5 volt 204-Pin DDR3 1333Mhz DDR3 SO-DIMM modules with 9-9-9-24 timing. No need for the crucial tool to tell you the exact same thing, although it might be good to have on hand for future computers. For earlier ones,
Mactracker can also tell you what you need.
With the 2011 model, if you only want 4GB of RAM
these modules should work
as should these but if you can spare another $40 and think you might need even moreyou can go up to 8GB now with any of
these or
these and not need to worry about replacing your 2x2 modules later. Sorry for throwing up so many links 10600 and 10666 RAM are listed separately, allegedly for marketing purposes but otherwise identical according to what I've read.
If you want a specific recommendation, I only personally have experience with
this G.Skill RAM since I got the shellshocker deal for $65 about a month back. It works nicely insofar as I can tell.
