You are right; costs to develop and operate these kinds of sites are high. While I can't recommend web developers specifically, I would recommend taking a look at some of the sites that offer video content and try to determine who designed their site--you might even want to call or email the website owner and ask. You might get a glowing recommendation.
And, while you've got them on the line, you might want to ask them about typical startup costs associated with operating a video website. You might also reach out to a company called Media Temple. This is a hosting company for many web 2.0 websites and they might be able to point you in the right direction.
Make it happen,
Lena
Lena West is the CEO and Chief Strategist of
xynoMedia Technology , a New York-based firm that helps high-growth companies leverage the power of social media, blogs, podcasts and online communities.