Nice bike! Component-wise you have gone for something good and sensible - 105 is nicely made, reliable kit and very good value for money.

A pedant writes: have you given much thought to the rims, # and type of spokes and spoking pattern? How about Mavic Open Pro rims, 32 holes, 3x pattern, DT stainless double-butted spokes? A bit vanilla, but simple and strong - I ride that sort of wheel with no problems and I weigh 190 lbs. You can go for much lighter but more fragile wheels... It's easier to get the tires off and on Mavic rims than a lot of other brands (like Reynolds!). Velocity rims might also be great, never used them though.

Bit worried about those forks though. I had a Dawes with straight steel forks and the jarring from the front end was horrible. However I had it converted to curved carbon forks and it is still jarry so maybe it is more the frame - cheap plain-gauge steel, yours should be much more comfy. My nice bike, also with curved carbon forks, is a lot more comfortable.