what kind of back links are good for PR ?

One way link is better always, and try to get links from different domains, this will be more better

 

Of course links with high PR! The higher the better!!! And one Way! After come the reciprocal links! They are also helping but not like the one way back links!

 

Oneway links are much better at passing PR - there is no doubt about it

 

just focus on getting links back to your site from other sites that are relevant to your topic. That's the best way to improve your search engine rankings. I've noticed PR doesn't really matter if the site linking back to you is in no way related to you niche. Your page's PR might increase, but your site's placement in search engine results won't get any better for your keywords. Just get relevant links.

 

This may be of interest (a table estimating quantity of backlinks required for different PRs):
checkpagerank.net/linkpack

 

you know I've heard so many theories that I am left to believe that only google knows