Backlinks for Marine Construction & Public Aquarium Site

I need to increase our traffic via direct links and via increased rating of search engines. The site is called: h-y-d-r-o-s-i-g-h-t-dot-c-o-m (please remove the minus signs) Our customers are a) architects b) construction companies c) aquariums and zoos (note: not the little aquariums you might have at home) Backlinks should be s.th. you don't have to pay for and that are permanent. None of the sites you use should be owned by yourself or by s.b. you cooperate with directly. All of the sites should be listed in google and free of any doubious seo tricks. Please note prices for one link indicating the google page rank of the page and if it is related to one of our topics. So, eg.: Pagerank 2, Not related to your topic: 5€ Pagerank 3, related to your topic, 10€ and so on... If you are interested you have to answer this question directly to me. You will be paid 100% after the finish of the job for each of your backlinks. Please also note, that our site will need all kinds of web related work, including content writing, and we are looking for a reliable partner for this. So see this also as a longer term option. We are willing to pay fair for good work.