what you need is quality relevant backlinks, not high PR links from sites that is not related to your site content. if you want to rank high for your keywords, then go for the quality and relevancy. high PR looks good on the toolbar but it doesn;t bring you any traffic
Probably easiest to simply buy one of the lists already out there. A simple Google search using your SEO extension and sorting mechanism can work wonders as well.
Social bookmarks, web 2.0 properties, article submissions, the list goes on and on.....but it's a whole lot of work.
submit your site to high pr quality sites. Do article submission, social bookmarking and blog posting.