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Well, if I was in your position, it would be a touch choice for me as well. Both of the cars are the cream of the crop, the only thing is the 6.0 is newer. What I strongly suggest is that you get the 6.0 and sell me your VT. I will buy it off of your hands for a VERY low price
Now, enough messing around. This really does seem like a dead lock. Can't you get the 6.0 and keep the VT, so you have both? If you can't do that, I say you should stay with the VT, simply because it's more rare than the 6.0.