Dear Sir,
I have two years experience in seo and I have handled many seo projects, to get high rank we did, directory submission, article submission, social bookmarking, blog commenting, forum posting, press release and video submissions. I will submit article in natural way, not in a day, 400 articles in 100 article directories will take 15 days.
If you want to make solid back links for your website then Social Book marking submission is more cheap and best way to get back links for your website.
I shall look forward to hear from you soon
With Regards
Munish