That’s what I want to know now, and I hope that someone can share a couple of suggestions. The project is quite massive so I want to hire professionals. What are some good options?

Hi. My answer will surprise you, I bet I found a great web design company by asking on forums, just like you did here. So you already managed to figure out the best method of looking for designers. As for some helpful tips, I have one for you. Here’s the professional website agency you should consider right now. They did a great job on a couple of websites for me. So check their portfolio and decide for yourself.