Best practise to move data to new datawarehouse partitions

Our DW is about 500GB and expected to double in the next three years.
Largest table has 290m rows, but some fact tables have as little as 1k rows.
We are also migrating to SQL Server 2012 (2008R2) by building new servers and will split SSRS and DBMS.
I was thinking I would only partition the larger fact tables, but my dilemma is moving the data to the new servers.
Trying to avoid having to load each table manually, so would moving the tables to be partitioned to a different database on the current server be a viable option, what about all the current subscriptions and SSRS reports ?
Then at some point (only 5 years data) we will need to start archiving, so I wanted this physical design to fit in with assisting the archiving process, seems crazy to partition every fact table or is that a better strategy ?