being someone on the long road to buying/building my firt cobra, I would really want an IRS now if i was building a car that was going to be seeing alot of track time i would want the same setup you did on DVII. and i suspect that is the $6500 price tag. money well spent. but for a car that may see an autocross or at a big stretch a track day a year $3500 seems to be where i would go.
If money was no issue you would be building DVIII