I had been looking for a good forum solution for tiepedia.com and I had tried Agora, CCBoard, and ninja board but Kunena is the one for me. Kunena did everything I needed, it has a great backend and awesome community. I highly recommend Kunena.
I used this extension for a free quote request, I tinkered with the code a little bit and ended up contacting the developer. I received quick response, I was super impressed and would recommend this extension to all. (it even has spam control if you need it)