Well, it's up to you guys.
Honestly, I think it would be better to have both sites and just integrate them. As such, you would have certain content on this site and the other on that site depending on its use, etc. The reason I say this is because Mansei today is more of a "Community Site" and is more general - not necessarily Jr. STF specific. I shall give you an example of what I have done for Kansas.
I have the main site www.kansasyouth.net…
and I also have…
jrstf.kansasyouth.net
wait.kansasyouth.net
whatsnew.kansasyouth.net
kontactz.kansasyouth.net
each is a separate site, wiki, etc.
and correlates with its title respectively
I have also integrated e-mail, spaces, maps, search, and radio into the site and each has its own name….
each member can now have a related Live space and e-mail address with their ten.htuoysasnak|eman#ten.htuoysasnak|eman
Once again, the choice is yours, but I would recommend you think about it before you make a decision, and let me know!