Those are the main two i use.
I actually work for a brick and mortar Web Design and Promotion company and we need to find the best Article Submission sites to start utilizing articles more.
So, what are the best sites for traffic and PR?
I find Ezines to be really good but really strict, they get rticles to the top of the engines easily. I use Goarticles because it's also really big but i haven't had as much success.