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I have moved your post to the VDI forums as it is a more appropiate place for it.
minimum of 786mb per guest maybe 1Gb
approximately 16GB system drive
make sure that you do not have any Serial or pararall ports assigned to the guest,
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I'd agree that is the way to do this. Without hearing more about it, VDI makes sense.
It should make even more sense in a couple days. Linked clones will reduce the actual storage needs down to changes from the base image.
Plan for discarding the VMs after each use. Use AD settings to persist the user data & profiles.
We are doing a vista VDI and vista is such a hog that it's 2GB of RAM and 2vcpu. let us know what you find.