Hello George,
I like the feel and look of your site. I have a (too) hard time reading the white text beneath your logo though, the tone is too similar to the background I guess.
Using Gotham feels allright to me, and I don't think you should be afraid of using it because everyone else does it at the moment.
Great idea about having the comments on the right side by the way.
I'm not sure, but your choice of brown color might come out as a bit too retro for me. Anyways, I'm not sure and I think you should keep it if you like it.
– Malte