SBS2003 replication to another DC

I am trying to setup 2 sites. In the first site, I will need to upgrade win200 domain to SBS2003. The second site I want to install a DC to replicate from SBS2003. Is that scenario possible? Can I install another DC in the first site? Can I install win2000 DC in the second site to replicate from SBS2003 in the first? will win2000 function withen SBS2003 environment?