I'm attacking 20 keywords (don't ask why lol), and I'm setting a 3 month strategy for SEO. I'm wondering if 160 all original, unique, 500 word and SEO optimized articles are enough (52 articles per month). I'm guessing 15 should go on the site, and the other 37 will be submitted to ezine, squiddo, etc per month. And I'm trying to figure out how to build tier backlinks with those? Any advice would be appreciated!