I was looking for a 105 or Ultegra bike for training toward my 2013 mtb endurance race goals. Past bikes owned include Calfees, Litespeeds, Orbeas, etc., but for this particular need it was a lightweight carbon comfortable bike that didn't break the bank. I'm a Shimano guy and understand SRAM is lighter and works great, but my bike tests pointed me back toward Shimano. This is what I purchased....
2012 Scott CR1 Team weighed 17.4 pounds and cost $1200 (brand new leftover from dealer). Sold the heavy oem wheels and tires for $300, went tubeless with Bike Hub Store 23mm wide rims and lost about a pound of rotating weight but put me at +200 dollars. So now I'm in it $1400 and weighs 16.4 pounds. Tossed the heavy saddle and put on my crusty worn out Fizik Antares braided carbon which got rid of about 100 grams, a Williams Maxim ACS bar (100 grams came off, cost me $75), an Ultegra cassette cost $45 new from ebay and saved, gosh, a lot from the Tiagra 12-30, a Performance OS stem for $20 and saved about 50 grams. I'm in it about $1495 and my 105 equipped tubeless 16 pound road bike fits my needs and came in way under budget.
I'm done spending money on Dura Ace and full Ultegra bikes. Money goes toward great fitting frame and nice light stiff comfortable wheels and tires.