I wouldn't look at it as which is lighter-therefore-the-better climber. I'd look to see which one has more comfortable geometry for your body type. I tried quite a few road bikes, both aluminum and carbon, and for me it was love at first ride on the Ruby. The Amira had me too stretched out, and I felt more road vibration on it. Some people like to feel the tranmission of the road through their bike. I loved the feel I got on the Ruby Comp, so I bought it. I really liked the Ultegra components, too.

Traditionally speaking, though, the more stretched out racing type frames are considered better for climbing because you have more of your weight over the front end. It is not the weight of the bike so much. If you want to make your bike lighter, as others said wheels make a big difference as does the component group. Most hardcore roadies upgrade their wheel set from the stock ones.

I've been taking a friend of mine shopping for road bikes, and last week he tried a Roubaix (men's version) along with some other bikes. After testing he loved the Roubaix, but there was something I noticed that I haven't seen with any of the other bikes he tried. He looked like he was just gliding on air, almost floaty. I don't know how else to explain it. When we ride together he's commented that I look like I'm just gliding, smooth and effortless. I had no idea what he was talking about until I saw him on the Roubaix. He got that same feeling from an Orbea as well, though I couldn't see it on that bike. The salesman (a knowledgable one ) did tell him that the Roubaix would feel a little bit heavier than some of the other carbon frames, until he got going. Then that would disappear. It did. Coming from a mountain bike where he averages 12 mph he went whizzing down the road at 25mph!

I really do love my Ruby. It's a much better/faster bike that its rider, lol. Try them all out and see what feels best to you. Try to ride up some inclines in the area to get a feel for the bike's climbing abilities. It may be that the Amira is more what your looking for, or the Madone, or even some other brand/model.