It's not often a service impresses me so much, but I just had to say a word or two about the The Content Authority
They have 4 levels of article quality, basic, great, excellent and expert, I ordered 12 1000 word articles, 11 excellent and 1 expert article and they were all completed the SAME DAY!
The quality of the articles were fantastic, I did have 2 of the articles amended but that was just because the keyword density was a bit too low.
One of the cool things about this service is that you can send jobs to your favorite writers.
TIP: It seems that you can actually get articles written cheaper by authors that you have added to your favorites, for instance, I added the guy who wrote my 1000 word "Excellent" quality to my favorites and now I can send jobs to him for the same quality at a cost of 0.038 per word. :-)
The cost per word are as follows:-
Basic - 0.01
Great - 0.015
Excellent - 0.02
Expert - 0.05
Their customer support is awesome too, I contacted them about their keyword density gauge and they replied within the hour.
A word about keyword density....they work it out a little differently to what you may be used to as they equate ALL the words in the phrase so it's best to state to the writer exactly what you want.
You can also post directly to these services from within your account:-
Build My Rank
Personally I think you are better off outsourcing this elsewhere as you can get it done cheaper.