Here is a little case study from my own beginnings in SEO...
I had a site that was just starting out and I solely did article marketing to promote the site. I used Article Announcer and I dropped like 30 unique hand crafted articles to about 2 - 3 hundred directories within two weeks.
In about a month if that, I had crazy traffic and TONs of legit backlinks to my site. About two months later, every single backlink dropped except for like 20.
I did a little research and all my articles were in the directories and the backlinks were just not counted anymore or something. I guess that whole duplicate content bs caught up to me.
So my advice is this. Just submit your article to some of the biggest names.
Ezinearticles dot com
Goarticles dot com
and a few others.
Those will bring you the most traffic anyways.
Then just re-write the article and re-submit to those directories again!
That is what I've been doing lately and the backlinks stick and bring you tons of traffic.
Hope that helps a bit.