RAM question resolved..

I have an HP model Pavilion dm4 1165dx laptop. It has 4G of RAM in two sots and it only has two slots. I can upgrade to 8G but I have to go with two 4G sticks. So what is in there now is of no consequence because I have to replace both sticks to get to 8G.
 
My question is this. Should I just go with HP RAM or should I use Newegg or Tigerdirect and get some other RAM, AND... if I get different RAM what should I take a look at. In the past I have used Kingston, PNY, Crucial, and Patriot... but as far as specs and types etc, I really don't know one from the other or what will work for me and about what may really make any difference for me (I don't want to pay extra for something that will make no difference).
 
The RAM that is currently installed is listed as 1x2 of SODIMM other 1067 MHZ Samsung. I cannot figure out how the get the HP memory finder to work, I've tried several times.
 
Crucial recommends this amongs others:

8GB Kit (4GBx2), 204-pin SODIMM, DDR3 PC3-8500 memory module

sorry about the large font... this is their recommendation page link: http://www.crucial.com/store/listparts.aspx?model=Pavilion%20dm4-1165dx&Cat=RAM I think they have the 1067 and 1333. I assume the 1333 would be faster or better but I am only guessing and will it work well with my mobo and bios? Could I run into unforseen problems by changing to some other spec?
 
OK, I have looked more and am really getting frustrated trying to figure out if there is RAM that is better, faster, more reliable, etc. I don't mind paying more if I am getting more. IF I am going to do it I wasnt to do it right. I reckon that the options from Crucial give a good enough idea of what will work. It looks to me like it is between 1067 and 1333.
I am sure there are people here who know if there is some new or "extreme" RAM that is better. Let me know your opinons, I need them. I am using 64bit and have had no trouble but I figure, why not max it out.
 
Thanks for ANY and ALL help!
 
Julien