Форуми / Cotonti / Support / Updating from Seditio to Cotonti

Plugin : autojoiningposts | This is available as a standard Cotonti feature.

Plugin : autolevels | Not sure if this plugin is ported to Genoa. Most likely, not.

Plugin : coloradmin | Hopefully, you'll be able to do it using coTemplate.

Plugin : gallery | I'd recommend switching to Pageavatar / jQuery and list/page modules rather than using clumsy Seditio plugs. Example: http://sandbox.seditio.by/list.php?c=gallery.

Plugin : leetlogin | coTemplate covers this completely -- no need for a plugin

Plugin : memberterms | Search for Genoa port.

Plugin : moviegallery | See gallery note above

Plugin : myforums | Search for Genoa port. I would scrap this.

Plugin : pmadvenced | Search for Genoa port

Plugin : postcountrank | Hopefully coTemplate can handle this

Plugin : randomurl | What is that?

Plugin : recentitems | Use standard plugin

Plugin : seourls | That's the problem. I haven't seen any positive reports and complete tutorials on that.

Plugin : shoutbox | Genoa minichat plugin is available

Plugin : textboxer2 | No need for this anymore

Plugin : topitems | Tiny plug

Plugin : watermark | I do not think we have it

I believe, you'll have to make a decision out of the three options: 

1. Switch to the stable and plugin-rich Genoa now and after sometime upgrade to Siena (this could be a wise choice for there is no serious advantage for you in Siena)
2. Switch to Siena now and wait untill the plugins get ported (can take quite sometime, or prove that some of them are not worth it :) )
3. Stay with Seditio (worst choice, hope no explanations needed)