Definitely stick with promostudio.com. Sounds like a word-of-mouth kind of business, unlike tumblr/flickr/reddit which spread virally by link sharing so verbal spelling is less important.

I tried to find some more domains, but I was surprised how saturated the domain space is with anything to do with "video". Best I've found is:

pitchproduction.com

hypespotlight.com

(more here: http://wedomainsearch.com/#/dYVtJ0zS)

Though promostudio.com is probably better.