As Sperm said, > 1 per domain is useless.
Besides that, do your homework on each of the domains first.
- Check that the PR is valid, including future PR (several online tools to do this)
- Check Google's site: link: options to make sure the site and pages are in the main index and the page you are getting a link on isn't in the supplementals. For links you'll get an idea of how many and where from. There are also better BL tools for this online
- Check the domain's history, blacklist status, etc.
- Any other OBL on the sites? Check them out and see if they have gotten PR from this link? (Not easy to determine, but it's possible if it's obvious one way or another).
- Check the cache date in Google for the pages linked from over a few days, how often is it updated? For the best effect you want a page/site that is being crawled daily and most pages updated daily or close to it.
- Check their IP/host - same network/host/box, etc.?
Not really much work, most can be done from sites like DomainTools, and after checking the first couple you'll get a sense if it's a deal or not.
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