I'm building a new bike (well, I'm not actually doing the building, I'll be having the LBS assemble the pile of parts I bring in). I'm starting with a Surly Cross Check frame and having a Mavic A719 wheelset built by Peter White. I plan to use drop bars with "brifters". The one thing I'm hung up on is the drivetrain- road vs mtn derailleur, cassette, crankset, etc. Can you pretty much just mix it up? I was thinking of using mostly Shimano XT parts with an 11-32 cassette, and possibly a Sugino triple crank . Are these parts compatible with the brifters?
I should mention that I will be using panniers loaded with clothing and lunch, and I weigh about 240 lbs (hence the heavy duty wheels).