Permanently moved - moving folder to a server;

Hey guys, how it would look in eyes of google:

I have one folder who is PR5 on

wwwww.site.com/~mytopic/

and now i wana this mytopic move to wwwww.mytopic.com

but I'd like to move it permanently; site.com is estabilished domain and doing well, but idea is i'd like to have it to be like seperate domain and adding more pages in it (currently only one long page but i wana split it in smaller);

would google assign all the great rankings and PR that it enjoys on current location and as I add new pages would they be understand as pages of wwwww.site.com/~mytopic/ part - it means, like that the whole domain is well estabilished and without any problems would rank these pages high as well??

( i know about backlinks, for sure, but i wander exactly about these new pages ) would it work?

Any idea?

 

I guess No. This link will work like newly aded link.

 

If you use a 301 redirect you will keep all of the backlinks and PR for those pages.

 

Yeah, but what if i add more new pages, or basically I should build it there (the structure and linking) and then on the real domain it will be like mirrored? hmmm