For functionality and security, it is always best to use the latest version of IPS 4.4. As for plugins, this varies per community basis.
Most of those sites you've linked use a custom or modified theme,
It is always best to use custom made or completely original designs for your website. However, there is tons of free templates across the internet.
I have had a few problems using nulled forum software with Email Verification and Theme Customization, but not in recent time.
I believe that WebFlake uses the most updated version of IPS (nulled).