Customized Buy it now button redirect to other site

Hi,
As i already have made a store in opencart, i am quite comfortable with it.

Now i am planning to open a shopping comparison website like junglee.com

Where "Buy it now" button should redirect to that item page on seller's website. Also sellers logo should appear on product page. Shopping cart will be removed. Respective changes in admin too.

Is there any idea, how to customize prodect page feature?
Or is there any extension available for the same?
Or any other free opensource software available with these features.

Please suggest
Pooja