Aside from these points, it should have also a quality content (contains information useful for visitors)
Many people said that higher PR is better, so tell me 1 backlink from PR8 = ? backlinks from PR1 or PR0
A quality backlink is a backlink that links to your Web site using your keywords or keyword phrase, and also appears on a Web site that has the same theme or similar content topic as your own Web site.
A page that has a couple of years history, PR2-PR4, Not to many links leaving the website and also i always check the links leaving the websites and check to see where the backlink is.
Oneway links from high page rank websites are the best quality backlinks and also it should not be a no-follow link
- less outbound links on the same page - high PR - related to your niche - dofollow - in-content link (not footer) - homepage or sitewide link - etc. If you don't have a decent budget to buy links from sites you like then just build links, any link is good. While you're looking for "quality" links your competitors are building just links like mad and will win the SEO game.
Thanks for sharing all good suggestion but for me If my site is getting good no. of visitors through that backlink than it would be valuable backlink for me...