RAM for unibody

I have a unibody macbook 2.4. I'm looking to upgrade from 2gb ram to 4gb.

i've been checking out the ram here:
Apple NEW MacBook (Aluminum) 2.4GHz Intel Core 2 Duo 13" Screen (1066 DDR3 PC3 8500 SODIMMs) Memory

As well as newegg.com

I've noticed that some have different cas latency and timing? Anyone have any insight on that.

And how about a recommendation from this page:
Newegg.com - DDR3 1066 (PC8500), For Apple Notebook, Mac Memory, Apple & Mac, Computer Hardware

Hmm. Im not to sure about those sites. I have been fine with newegg.com but Im not sure about the other and wheter or not you would be getting the right RAM.
But this site is going to give you exactley what you need and its gauranteed to work with your MacBook Pro.
Computer memory upgrades for Apple MacBook Pro 2.4GHz Intel Core 2 Duo (15-inch DDR3) MB470LL/A Laptop/Notebook from Crucial.com