You can always use all the info above or you can mix them all up.
This is what I do.
~ I find few do-follow high PR
~ then I load scrapebox with that list and scrape all url pointing out from those blogs (people that already built backlinks on these blogs)
~ then I scrape all the backlinks from people that build backlinks on the high PR
sites (get backlinks of the websites that posted on the do-follow high PR
~ analyze the list and get all the high PR
blogs and with do-follow
Usually I get a list 5 - 10 times bigger, at least.
Hope it helps for those that own scrapebox.