We will be migrating / replacing old servers that have SBS 2003. Which newer OS's CAN'T you migrate to? We no longer need Exchange, so Server 2012 should suffice, but don't know if you can migrate from SBS 2003 to Server 2012 without a hitch. I would assume SBS 2011 migration "should" be safe, but hate the extra bloatware that we will not need anyhow.
Server 2008 Standard
Windows Server 2012