Like you, I have a SPF Cobra and awed at the quality and fit. I'm sure their GT40 replicar is just as nice; however, I'm really partial to the Mk I lines. I'm still baffled why they went for the Mk III..
Having said that, I also have a CAV GT and I think it is the closest to the original build. I love it, and I'm in the process of upgrading the suspension and installing a set of Webers. But comparing the build quality; particularly the paint job, it's a notch below that of the SPF. Not sure about the current crop coming out of AutoFutura; maybe it's a hundred times beter since my roller rolled out 5 years ago.
