Hi Deji,
Hope all is well my friend :) You can use the 6.0(1) Media and then upgrade "during" (not after) the Installation of the Subscriber or second Node. Make sure that the License for the new Node has been added to the Publisher before starting.
Applying a Patch (upgrade during install)
This option allows you to upgrade the software version that is contained on the installation disc with a later release. You can only apply one patch durng the installation process.
NoteEnsure that you have the software image available on DVD or on a remote server prior to choosing this option.
Step 1 Perform all pre-installation tasks that apply to your site.
Step 2 Follow the procedure to begin installing the software on the
DVD to your server.
Step 3 Follow the procedure to apply a software patch.
Step 4 Follow the procedure for performing a basic installation.
Step 5 When the First Node Configuration window displays, choose
No to configure the new server as a subsequent node.
Step 6 Follow the procedure to configure a subsequent node in the
cluster.
Step 7 Perform all post-installation tasks that apply to your site.
From this good 6.1 doc;
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/install/6_1_1/install/cmins611a-cm.pdf
Hope this helps!
Rob