Would you consider a Lynskey Helix Pro? Ultegra di2, hydraulic brakes. 6/4 titanium frame. $4800, but then take 20%, $3840. Free shipping, worldwide. Includes Lynsey post. FSA stem, bars, and Metron wheels could be updated in the future.

I would start by figuring out what your stack and reach number are, and which bike will fit. For example the Canyon Aeroad and Ultimate got very differently, with Aeroad being quite a bit lower and longer.

Once you’ve figured that out, just go with the bike that fits, has a color scheme you like, and ideally is on sale or well priced. All these mass produced carbon bikes are pretty much the same.

I’d go Di2 now. It will be much cheaper (long run) and lower hassle to get Di2 now rather than upgrade later.

Never mind all those fools that tell you about bike fit, that ridiculous list you compiled, or your silly budget. Head straight to your BMC dealer and pick up a TeamMachine SLR01 Disc no matter the cost. You're welcome.

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I do have to say, I have a TM SLR01 Disc/Di2 and love that bike!

Assuming we're talking calm-weather flat-ground speed, 3.75W/kg usually gets a rider considerably more than 31km/h on a road bike.

Anyway, what do you consider "significant"?

All those bikes will make perfect commute bikes. They are designed for everyday use, and so no issues with having it chained up at work with the other commuter hacks. And the long and low geometries are ideal for wearing with a rucksack as that means that you'll not have any gap between the back of your helmet and rucksack that would otherwise allow the air to vortex.

I’m a Specialized guy, so I would learn toward the venge if that’s what you like.

I have a roubaix now and it’s great.

My shameless plug... if you are a 54cm size, I have a 2010 Specialized S Works Tarmac frame set I plan to sell. It is just hanging in my basement right now. Not a scratch on it.

Personally I see commuter bike and race bike as separate bikes. For commuting I value reliability, low maintenance and value over performance, for racing it's the opposite. E.g. My commuter bike has a steel frame so it's no problem if it picks up scratches or dings from being used every day, locked up in a shared use bike room, etc. It has wheels with box rims and high spoke count that are bulletproof and easy to repair or replace. Tires are Schwalbe Marathons that go 5000+ miles without puncturing even on roads littered with broken glass and potholes. Drive train is lubricated with a thick all weather lube and doesn't get cleaned or re-lubed very often. You get the idea. Whereas my race bike is a Canyon Aeroad which is relatively fragile (low spoke count wheels, thin walls on the frame, race tires), expensive to replace parts, but is lightweight and fast.

So if it was me I'd use the Trek for commuting most of the time, and buy yourself a nice race bike equipped with nice fast tires, that you use for racing, training and group rides when the weather is nice and which doesn't get subjected to the wear and tear of commuting. In which case the Aeroad is very nice and Canyon are probably better value for money than any of the other brands (unless you get a sale bike or good discount from your local shop). And I know several people with Canyon Ultimates (including one ex-Canyon employee) and every single one of them will admit that they wished they'd paid the extra to get the equivalent Aeroad model.