Hi,
I got really excited when I read your job posting. I do a lot of these types of things for different companies and individuals, including advertising professionals and a major corporate recruiter.
A little bit about myself, I'm a Masters Degree candidate in the field of "Creative Technology," e.g. using the Internet for the purpose of branding and advertising, at the nation's top advertising graduate school. I've presented work to senior level officers of companies like Procter and Gamble, Audi, and a few major advertising agencies.
To give you an idea of my strategy when I approach problems like this, I would do an audit of your existing properties, the link portal and the hosting site, then analyze some fertile grounds online where things like your site could really get some new users, and then relay a strategy to you that would maximize your hits as much as possible with your admittedly limited budget.
I have done plenty of work for clients with small budgets, so this is right up my alley. I'm sure there will be bids lower than me, but I promise you none of them will give you the thorough, thoughtful, and effective work that I will.
Let me know if you have any questions, and I look forward to working with you.