For Get high quality backlinks. Your can do--
forum posting
submit article on 2.0 websites
article submission
comment on dofollow blogs

Purchasing back links can also help. I've done so and moved up pretty quickly. You just have to make sure that the links you purchase will not hurt you.

Forum posting, article submission, blog posting, pr submission are the best way for getting the quality backlinks.

If you submit your website in high PR and good traffic website, it's quality of backlinks for your site that will help you improve keyword ranking.
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Best is to search on Google or visit here Linkmarket.net

Thanks

Social bookmarking, forum posting, guest posting, blog commenting, etc all these methods will help you increase ranking.

If you want quality back links, then you need to find do follow, high PR sites which themes are related to your site as well for link building

If you want to get quality Back links then you should work on quality sites. You Should do Forum Posting, Bookmarking, Blog Posting and all that..

Guest posting is the best option. Genuine also.

Yes, obviously need to do social bookmarking with do follow websites, article submissions with quality content.