I agree with Kirk.
The MK2 has not gone the way of the MK1 at this point. The MK2 is right there. In New England region there are MK2's that win and beat the MK3's consistently.
From an investment point of view, avilability of parts, and longevity - one would not consider an MK1 platform for ITB at this point. If the price is right then an MK2 is a great way to go. Some of the stuff you can move over from your MK2 to an MK3... struts, rims, etc. The MK3 will hold it's value longer if there is such a thing in a race car then the MK2.
B