The Merlin frame is worth MUCH more than the CAAD 6. Titanium frames new go for $3500+. The Cannondale CAAD 9 frame is like $800. If pricing is exactly the same for both bikes, get the Merlin and sell off the Shimano if you don't like it.
As much as I love Campy, I have to agree with everyone else here: go with the Merlin. You can feel the difference between frames but you won't feel much difference between the components, especially at that level. You can always change it out later if you don't like it.
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