If we're still voting:
I would NOT tour on an IGH. I've tried it and didn't like it (heavy-ish feel, worry about unservice-ability, gearing range, etc). I do commute on an IGH daily and love it.
I would NOT likely tour unsupported on a CF frame. I have done light touring (with support options) on CF, --but long or exotic trip totally unsupported?, ...nah.
I prefer the simplicity of canti rim brakes.
I prefer brifters but might carry downtube levers just in case.
My light tourers are 650B but I would probably choose 26" for long or exotic tours.
Shimano 105 or maybe ultegra.
Probably dynamo front hub for lights and charging options.