[janpieterz]

I'd look for a couple of high quality writers that you can fire a couple of ideas over. Looking for them might take some time and cost you a little, but having a small group of valuable writers where you appreciate the quality is very valuable.

I often use my girlfriend as well, who is a native speaker (I'm not) to do it. She has done this for a range of other companies as well, from food/beverages to legal, political and to a certain level technical. Don't shy away from paying decently for better articles. If it's just a simple thought being published that can be written quickly, pay less. The good thing about establishing a group of trusted writers is that you can look to other payment methods than per letter/word. Some blogs are very easy to write, some are very hard and require a lot of research. Paying per hour might then be a better fit, where the better writers will cost you a 100$ an hour, and paying per hour with a trusted blogger works, because if you feel they didn't deliver as expected you can talk about it, and they know they want to keep you, a trusted client, so they'll less quickly engage in dodgy practices.