Hi,
in any way either you go to W2K8 or to W2012 with you new installation, make sure your old database is in a good and healthy shape. Consider to check "omnidbutil -chktblspace" (solution is posted on my blog - www.data-protector.org), remove old stuff no longer required, run a purge, export and import the database... This will increase the chance for a successfull migration to DP 8.
Best regards
Daniel