I recommend going with a supplier who knows Macs and will offer guaranteed compatibility, and a no-cost (no shipping, no restocking) return if it doesn't work. OWC, Data Memory Systems and Crucial are the most-recommended here on MR.
Alphaod, it would be more helpful to provide a specific link - as there are dozens of models of OCZ RAM on NewEgg that wont work in Macs, and NewEgg doesn't provide any compatibility guarantee or support. (actually, neither does OCZ, they don't list Intel Macs into their memory configurator at all)