Thanks for all the replies guys, much appreciated. Definitely BB7’s as I have read a lot of good reviews.
I am pretty sure the mechanical disc would be better than my linear pull brakes, I have had mechanical discs before and they were much better. I’d love hydraulic discs as the ones are my mountain bike and my hybrid are amazing, but I am afraid that is out of the question as they won’t work with the 105 brifters.
I’ll look into the full wheel set up, but I was looking to save a few pounds, but also to make sure the front matched the back, it is a Colnago Worldcup cyclocross so I didn’t want to deviate too much. On the other hand though I suppose selling a full wheel may get me a few quid more.
As for a 29 inch wheel, won’t that raise the bike a little, or not be balance with the back 700c ? Or I am not thinking straight?