I would go for the DFly. I have ridden a tetra, but not a Luna. I know someone who has a Luna and a DFly, and prefers the DFly, it is a better bike.
I find my DFly is very light in the rear, not bad, but just a feeling. I also ride a Trek 5900, a much more dead bike, but stiff and a heavier feeling in the back. The DFly is a much more responsive bike than the 5900.
The biggest problem with the DFly is you have to really go for high end components to get the most out of the bike. I would go all Campy Record, or Record and swap out some things where you can save some weight, like in the brakes (Zero Gravity's are great) and in the pedals (Bebob if you want an all steel axle, not Ti like Speedplay). You will also want light wheels. I use Topolinos for everyday stuff, but you will want to go with a carbon set if you want to race. Light wheels are to die for, they just go!
You should be under 16lbs for the bike with out any issues, more if it is a small frame.
For a light weight climber, I would not spend the extra 1/2 pound on the frame, you will not be happy with it in the end. Go DFly and end bike envy once and for all.
Bruce
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