RAM upgrade: 8GB or 16 GB? macbook 2GHz

Hi people,
I've seen similar questions to mine but the model is not exactly the same to mine. I have a macbook 2011 model that runs Snow Leopard, and the specifications are :
Model Identifier:          MacBookPro8,2
Processor Name:          Intel Core i7
Processor Speed:          2 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          6 MB
Memory:          4 GB
Boot ROM Version:          MBP81.0047.B27
SMC Version (system):          1.69f4
Ram is DDR3 1333.
I would like to upgrade my RAM to improve its performance because I need to work on many programs simultaneously and the virtual machines that I run are not satisfactory. At a store that is collaborating with apple, they suggested that I should better upgrade up to 8GB because of the processor frequency (no more than 2GHz), but how can I confirm that ? Can I have an official answer by Apple? If Apple approves it I would rather buy 16GB ram. But if it doesn't fit, and need to change with 8GB afterwards, the store doesn't return the money difference to me.
They also mentioned that Apple provides either Kesington or FCM. Now they provide only FCM. What is your opinion about this brand? What about Crucial or Geil for example? Would there be a problem?
Please give me feedback !

Your model supports:
Maximum Memory
16 GB (Actual) 8 GB (Apple)
Memory Slots
2 - 204-pin PC-10600 (1333 MHz) DDR3 SO-DIMM
There is no official Apple answer on the forums. Apple is not here answering questions. We are users just like you. Good RAM sources are:
OWC
DataMem
Crucial.com
Just be sure you get RAM with the correct specs. Although your model has been shown able to run 16 GBs, this is not the official Apple spec which is 8 GBs. That means that for most models like yours 16 GBs will work, but there is no guarantee it will work in every Mac in your model class.
If you will be running emulators, then allow at least 2 GBs of RAM per running VM plus 4 GBs for OS X if you need to run more than a couple concurrent applications.

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I am installing
http://www.amazon.com/Komputerbay-667MHz-PC2-5300-PC2-5400-SODIMM/dp/B004LT8LS4/ ref=cm_cd_al_qh_dp_t
Komputerbay 2GB 2X 1GB DDR2 667MHz PC2-5300 PC2-5400 DDR2 667 (200 PIN) SODIMM Laptop Memory
I get no beeps/ flashing lights. The white power light stays lit, but nothing else happens.
My MacBook Pro is a Model A1150 15" Glossy 2.0 Ghz
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