Brand New Shimano 105 or gently used Ultegra 6700?
After much research and several test rides, I've decided on a new bike at my favorite LBS. It's in stock and fits me perfectly, and is currently built up with a full 2012 105 group.
Here's where I need some advice. For the same price, I can have the bike built up with a full 2010 Ultegra 6700 group with about 2500 miles on it, that he just bartered/traded for. It would include a new chain and cassette. I know the original owner, and he's very meticulous about cleaning and lubing his drivetrain.
So help me decide! For the same price, would you buy the exact same bike built up with new 105 or gently used Ultegra 6700?