I'm hopeful of setting Sonar on a new comp.. but have been thinking of what programs to install from previous versions of Sonar.
I can assume that Sonar X3 had the most up to date versions of most programs.

Would it make sense to note which versions of sonar contained the most up to date versions of :

Pantheon : Sonar 8.5
Guitar Rig Le 4 : Sonar X1
R-Mix : Sonar X2
V-Vocal : Sonar X2

32bit
VC-64 Sonar : Sonar X2 Producer
Beatscape : Sonar X1 Producer

I never had 8/8.5, so Pantheon I never got. That must be carried forward from there. X1 had Guitar Rig 4 LE, and X2 had R-Mix and also the last inclusion of V-Vocal. Those tend to be the most popular ones brought forward into X3.

was v-vocal unchanged or improved during the years?

The dll version and modified dates from from the VVocal directory
Cronus 1.5.2.5 12/30/2011
VpEnc 1.3.0.0 12/30/2011
VPSoloDec 1.0.0.2 12/30/2011
 
Beatscape was last bundled with X1 Producer.
VC-64 was last bundled with X2 Producer.