As Version 7.0 supports DTS, then perhaps the solution is to migrate to 7.0 first, then use DTS to get from 7.0 to 2005. Or use multiple steps: 6.5 to 7, 7 to 200, 200 to 2005. These are all proven to work and lots of help can be found making those individual steps, where-as jumping from 6.5 to 2005 has been accomplished by scant few.

Might just be the answer...