2 short 3D animated webinar videos - one introduction and one exit video

We are a procurement consultancy that focuses on e-Learning and live, instructor-led training (webinar style). We are looking for two videos to be an introduction to our webinars and a conclusion.

One short 3D animated introduction video. Animate our logo in a techy and professional style. We do not want to go overboard with our logo (we don't want to look like we are overly self-promotional with our logo being the centrepiece) and do not want any cheesy or over the top animations. Add in upbeat music.

The other short 3D animated video is a an exit video for a webinar. Very short with a 'thank you for participating' shot with a short 3D animation of our logo at the end. Upbeat music in this one as well. Same techy and professional style.