yuri,
Lot many people i see understimate the power of a text link. Actually its unfortunate, i am not blaming anyone, don't mistake me.
One of the major benefits you get is the google PR, particularly when i place the link at the bottom of every page on my site.
Popunders are generally disliked by more users, hence i prefer a text link. I hope you can consider, let me know.
I don't generate any revenue from that site, i don't have any ads as such. Its an inspirational site.
Let me know, if u should be interested, i'll send you URL of the site under consideration.
Cheers