After reading this forum for about a year and a half I have come to realize that if I want a real answer to a biking question i should come here. You all trump the Google machine with your real life experiences, and not trying to sell me anything.

That said, I am looking at building a soma double cross. As of right now I commute on my Yuba Mundo, which I bought when i decided to go car free for anything under 6 miles. The bike is a godsend, and I have moved a washer dryer combo with it but I am slowly starting to realize that being able to zip around quickly is pretty nice as well. I can't zip around in a bike that weighs in at 102 pounds with my child seats and bags on it.

I know next to nothing about component sets, i am learning, but there are a TON of acronyms and measurements in metric systems and my brain is still trying to wrap around it.. I found this

http://kpr.craigslist.org/bik/1938171800.html

and was thinking about using it as the parts donor for the Soma build. Everything I have found said that the 105 group is pretty dang good. I plan on buying a different non-carbon fork, but as far as the drivetrain and handlebars and brakes/tires/etc...is this a good deal?

I don't know if this actually belongs here or in the road bike thread so i will post it both places. I don't know if that is taboo or not and I apologize if so, just want to make sure I put it in the right spot.