>I will give C: 500 GB and split the rest between D: and E:. Right now the C: is about 260 GB so I will have plenty storage for the future software.
>Thank you very much for your suggestions. While tomorrow some people will be watching this "unimportant event" :), I will be doing something very important :)

I always try to minimize the OS/C: partition size. I have an xCopy directory outside C:, where all portable software gets installed, which can be used by VMs as well. In dedicated VM C: is between 40 and 90 GB, in long-running machines still below 120 GB.

As I try to never use documents and settings, only programs need more space, and they are frugal compared to media stuff ;-)