What will benefit my site's PR most? Buying blogposts or blogroll links? Or a mixture?
Blogposts, because blogroll links are mostly seen as paid links, whereas blogpost links aren't
A link is a link though, but blogposts usually stay forever on the blog, while blogroll links are for a period, so that gives more value to blogposts too
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I'd agree with Aquarezz and say Blogposts. A Blogpost may give you a single link or maybe two, however a blogroll could give you sitewide links(could even be 1000+).
Not that a blogroll link would harm you but it holds very little seo benefits just like a Forum signature link.
A Blogroll link comes in the 'paid links' category which Google insists be made nofollow. Hence such links are feeble as compared to a link from a blogpost which is normally niche-specific and in-content which comes in the category of the most organic/natural link.
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Why pick 1? I'd make a list of what you want to do, then decide what percentage of funds devoted to each deal...
ie for these two, if you want to emphasize blogposts over blogroll links, then:
Blogposts - 75/80% of funds
Blogroll - 20-25 %
Or some other relevant percentage.
One thing I'm considering personally after doing some competition research is putting some funds against blog commenting (or doing myself in small doses) again after seeing the main site I'm competing against using comments and wordpress footer links only to be on the first page for a competitive word.
I would also say if you're going the post-only route, to work into Web 2.0 property posts as well. Maybe pay someone to write the content, then you pick the properties and links to your content to use.
Anyway, regardless of what you choose to do in what priority, doing something is the most important!
Updating as in how?
Keep the same link but changing the keyword around?
P.S. IMO the best bang for your buck is this. Blogpost seem to work short term but bring people to your site providing that the blogpost is on a site that people see and read. Like a TV commercial getting fast response. People will slow down coming to your site after awhile. Blogroll work for SEO more then people. Very few hits do I see on blogroll links.
How often do you click links in a footer or blogroll? I very seldom do.
So if you want traffic the best would be to get listed on a well read site in a blogpost.