Buying RAM - G.Skill vs. Patriot

I'm about to buy some RAM at Newegg.com and I was wondering which I should go with? I've read reviews for both and they are both good for the most part and the prices of the two are very close so price isn't really a factor. One review I read stated that the Patriot Ram will not run at 667mhz and only at 533. Is this true? I've also read that the GSkill RAM requires a lot of pressure to install. I've never installed RAM before so I wouldn't want to accidentally void my warranty. How does the Patriot installation compare? Thanks a lot