Upgrading my Mac Book Pro 15 2011 to 8GB RAM

I need some advice to upgrade the RAM memory of my MBP? I want to upgrade my MBP 2011 from 4GB RAM to 8GB. I find on web this brands:
OWC: http://eshop.macsales.com/item/OWC/8566DDR3S8GP/
Ramjet: Mac Memory and Hard Drives: 8GB DDR3-1066 Kit for MacBook Pro - Ramjet, Inc.
Crucial: 8GB Kit (4GBx2), 204-pin SODIMM, DDR3 PC3-10600 upgrades for Apple MacBook Pro (15-inch, Early 2011) Laptop/Notebook, CT1898876 from Crucial.com

any of these will work good on MBP? does anyone knows if these are mac certified? are these good quality brands?
I'll appreciate any help
Thanx

Crucial has been the go to company for Mac RAM for awhile.

I might pay the extra $8 to OWC instead of Crucial just because of what I've heard of their customer support.

Wouldn't give that other company $30-40 more money - no way - no how.

I bought the ram for my MBP from OWC. Good service, quick delivery and the ram has worked perfectly. I've had it in my system for 5 or 6 weeks now. I agree with bobtomay's assessment of the choices.

Regards,

Pat