Can't make a decision! Help!

[brigada]

For that small a price difference, I'd do it in an instant.

[TigerMom]

I totally agree with everyone above. The price difference is small and worth upgrading to carbon. I am pretty sure that if you don't buy the carbon, after 1 year, you will want to upgrade to a carbon frame. A Giant carbon 105 for $1599 is a good deal. See if your bike shop can throw in a bike fit too.