How Much Should I Charge For ...

... for a blogpost on my sport news site?
It's an ongoing project of mine that has currently 100 articless, PR 1, and about 500 page views per day?
I've been doing quite a crazy link building campaign lately, therefore I am expecting to get a PR 3, PR 4 at the next update.
However, the site is receiving lots of natural backlinks.

So, how much should I charge for a blogpost on my site? (written by me, 300-400 words, 2-3 links and one picture)

We charge about €750 for a sponsored article... but we do have a specific targeted audience (regional).

Woah! If i charged that much, I think that nobody would have bought a blogpost.
Anyway, any other ideas?

$10 they write, $15 you write.

PR4 with a lot of traffic you can charge about double that.

10-20$ i guess,but wait for PR update,the chance to buy will be much better.

you could charge about 35 - 50$ depending on the your PR.

try to increase the content and pictures