More on setting up 64 bit plugins

Well, Sonar will give you the 32/64 install option, and you will also get the chance to override the location of the 64-bit plugins.
 
As far as where either 32-bit or 64-bit plugins are located, Sonar will launch with a default set of paths that includes the one you chose for the install.  Once it is up and running, you can launch the Cakewalk Plugin Manager and add whatever additional path(s) you wish.
 
I DO recommend leaving your setup so that you can launch EITHER 32-bit or 64-bit Sonar, in case you have projects that just do not like having certain 32-bit plugins present in 64-bit Sonar.  (This is a frequent source of much drama and anguish).
 
In addition, I suggest you individually test out the viability of each 32-bit plugin to work in 64-bit Sonar (for which there is not a 64-bit replacement), and create a sub-folder within your 32-bit plugin folder and move the 32-bit plugins that work in 64-bit Sonar to the sub-folder.  THEN, you can add only the sub-folder with the tested plugins that work in 64-bit Sonar to the search path for 64-bit Sonar, and voila, you will be good to go.  
 
Doing the above will preserve the availability of all of your 32-bit plugins in your 32-bit Sonar, because the search in the 32-bit Sonar will automatically pick up the contents of the new sub-folder.
 
I HOPE any and all of the above makes sense, and wish you the best of it all.  
 
Bob Bone
 

You can have both a 32-bit and a 64-bit install of Sonar.  Lots of folks do.
 
I was just explaining the part of putting the 64-bit one in.
 
Bob Bone
 

Maarkr
So as I'm planning to do a new install of everything on a 64 bit SSD and leave my old plug installs on the old 32 bit C drive (soon to be D drive) I currently have my VSTs primarily in C:/program files/vstplugins.  

Are you planning to run this machine as a dual boot Win 32 or Win 64? I assume the current C: drive is a bootable system drive for 32 bit windows, since the drive itself is (presumably) formatted NTFS not "32 bit." Nor is your SSD a 64 bit drive, so I assume you plan to install an new Windows 64 OS on that. If you are not planning to dual boot, then you are wasting drive space and courting trouble by having two system drives in one machine. The cleanest way to re-use a drive that is set up as a boot drive, would be to copy off the data you want to save there, delete all the existing partitions to get rid of the OS-specific stuff, create one or more new partitions, format the partition(s) and then copy your data back on to the clean drive.

I have a 240Gb SSD. You should have plenty of room for the VSTs on there too, just be mindful of sample libraries. I run ~70GB free on mine, and have a lot of "non-DAW" programs on it of pretty good size.