Thanks for your help.
I choose Versatility 4 because I want to find a Joomla template which will look like the default theme of SMF 2 forum.
You can see the default theme of SMF 2 on their official forum:
Simple Machines Community Forum - Index
Look at the light blue color, and the rounded-corner highlight for menu items. This is exactly the Versatility 4 menu style.
So, do you have any template that will match the SMF 2 default theme?