Best Type Of Links To Build For Better SERP

Natural links that people link to you naturally

High PR & High Traffic Directory Links will help, but not as much as natural links like hafsoh said.

To have quality backlinks, you should do:
Directory Submission
Forum Posting
Blog Commenting
Blog Posting
Article Submission
Press Release Submission
Social Bookmarking.

Do more Blogs and try to update it regularly here you can gain more backlinks and get popular in google and you should have write a new article for it. You can do Directory and Article Submission and if you have some news you want to spread make some Press Release Submission. There is another way in building some links try Social Networking.

Right, I think the blogs are more important for Google than others.

This are the following way that will help you for the better serp.

1. Directory Submission
2. Forums Posting
3. Blog Commenting
4. Submission to Bookmarking Site
5. Yahoo Answer Posting
6. Submission to Niche Directory
7. Article Submissio
8. Press Release Submission
9. Blog Post
1. Social bookmarking

Lots of methods are here to create quality back link. You can go with blog commenting, forum signature, article, social book marking and directory submission. Do provide appropriate link to get Quality back link. Don't spam on blog while doing comment posting on it. Do prefer high PR directories for submission.

Good luck.