how do you find high PR do-follow sites with scrapebox

hi

ok so im about to do some manual postings on high pr blogs, and i want to make my life easier ofc....

i searched for keywords for example this ones...

apple
seo
technology
microsoft
entertainment
news

blogengine blogs... i get around 430 sites, and then check PR, and about 20% are pr1+ which is quite low... and i dont really need pr1 but higher, there are higher but quite few, same for wordpress

do you guys have any footprint to use to find any higher pr blogs, if possible do-follow

thanks