Win2K server upgrade

We have a PDC running SQL 6.5 and Exchange 5.5, the primary partition if full and there’s nothing we could do to make more space, there’s no BDC. We purchased a new server with Win2k and are planning on running AD there; ultimatelly we want to have SQL 2000 running on the new box which will run some other apps, rebuild the PDC and run Exchange 2000 in it, what’s the safest and fastest approach to do this?