Buying a link in a Blog Roll

I am thinking about buying a link in a blog roll and have a choice between 4 pr3 blogs from the same person. What factors should I consider in choosing which one? I am pretty new to this but I am guessing the lower number of outbound links from the site the better? I would imagine the more pages on the blog the better because I would get more backlinks because my link would be on every page of the blog. Am I on the right track and is there any thing else? Non of the blogs are related to my niche, I know that would be better but that is not an option here. Thanks everyone for everything I have learned here.

Buy a scrapebox blast instead, you'll get way more for way cheaper...

The no of OBL is the most important thing.

The no of total pages does not play that big a role, because your links will be from the same main-domain.

But remember to check the links going into the domain and make sure that the PR aren't fake!

Thanks guys. Chrisss, how would I go about doing what you suggest? I checked the inbound links in yahoo site explorer and I see like 57,000 inbound links. And you say to check the page ranks aren't faked, if I just use SEO quake or any other page rank checker that is all I should need to do right? Thanks again