What to charge for advertising on a forum

What would you charge for a PR 3 forum homepage with a PR 2 forum index. Traffic stats are about 500-1200 uniques daily. Over 20,000 visits per month. Site has been up for 3 plus years. Not that Alexa is really important but the rank 530,283 pretty high and in India its 112,106. The forum is also active daily with a steady stream of regular visitors up to 30 daily.

Not to sure about the link type they want but Im waiting for a more detailed response of where they want to add it but this is what they sent me.

Not sure what to charge.. Any ideas? Thanks

 

This is much more depend on the niche of your forum.
If its insurance niche,then the price can fetch higher than normal non specific niche forum.

 

Its actually a Greek community.

 

That's no standard price, if you think the price offered is good enough, accept it
else, just reject it

 

it diffcult to say

 

Its easy if its a banner, simple text link or a 125 ad but this is a bit different which is why Im asking for suggestions.