So, luckily, I found xenForo!
The layout is so simple that I fell in love with it immediately (at the first sight), and as navigating more features and details in this forum, I found it's exactly what I want! It matches almost all my expectations,
- Simplistic and beautiful design
- Clean and light UI
- Superb concept considering the optimization of SEO
- (I personally like and was surprised) Integrated Gravatar service for new members
- Hover over JS does not support Touch Screen (it required to click on the object to function, and that conflicts with the hyperlink)
- Text editor does not support rich text buttons in any of the browsers on my iPad
- Some tiny CSS issues required more tests with different browsers
Keep up the great job!