Need Help in Choosing Memory

Hi there I am planning on upgrading my memory on my MacBook Pro and need advice on the memory.

My current config is:

2.16Ghz Intel Core Duo
1G DDR2 PC5300 667mhz
ATI 1600X
100g HDD

This was purchased in September 2006, and I am planning on buying a 1G memory stick.

I want to know if there is any difference in performance between DDR2 PC 5300 667mhz memory sticks made by different companies, because i have seen a stick for 31$ and one for 79$ the same type of memory, both work for mac, different companies and i don't understand what the difference could be.

Here are links to memory sticks I am considering to buy, but i don't understand what difference can be between them other than the manufacturer. Thank you for your help guys.

http://www.bestbuy.ca/catalog/proddetail.asp?sku_id=0926INGFS10075304&logon=&langid=EN

http://www.bestbuy.ca/catalog/proddetail.asp?logon=&langid=EN&sku_id=0926INGFS10097809&catid=20361

http://www.futureshop.ca/catalog/pr...ab=&PCName=&nAllReviews=true&logon=&langid=EN

http://www.futureshop.ca/catalog/proddetail.asp?logon=&langid=EN&sku_id=0665000FS10086622&catid=

http://www.futureshop.ca/catalog/pr...S10087541&catid=10487&atab=3&logon=&langid=EN

 

Yep I checked and I only have a 1Gig stick.