Yes niche submission works better if you do it on high pr or quality website.

I recommend building links to get readers to your blog, not to just increase your page rank. You can do this through guest posting. Or, if you have your heart set on increasing your page rank, you can look at software that automatically builds links for you.

You're not going to get too many visitors from that strategy though. That is, until you can get ranked highly in Google. :p

I bought a couple of expired PR4 domains using the method described by Brian Kindsvater (this is not an affiliate link, unfortunately) in his Genius Report. I linked my new website to these puppies. WITHIN THE SPACE OF A MONTH of the creation of my new website the website was ranked PR3. It doesn't get much better than that.

Niche Directories list only specific type of Businesses and Websites. They are also known as Vertical Directories. Unlike general directories, Niche Directories provide more link value and targeted traffic by listing websites that are specific to a particular topic or industry.

this is amazing

You must employ the white Hat SEO techniques such as writing unique and fresh articles, social bookmarking, article marketing, blogging, blog commenting, guest posting, yahoo answers, forum posting, video creation and use of social media.