FWIW. I probably wouldn't choose a bike with a Carbon Fiber frame for commuting ... particularly, one which is new, or relatively new.
Not only is it conspicuous consumption, but if you will be leaving it outside and out of your immediate view (e.g., through a window) then it will undoubtedly be a target of someone who is lacking in scruples ...
AND, a Carbon Fiber frame may not be is not happy when it is dinged.
FOX forks are good.
I don't know the hierarchy of AVID's hydraulic brakes, but I would be inclined to think that the Elixers are marginally better than their BB7 components.
For commuting, a $600 Hybrid with a rigid fork is probably a better option ...
OR, a JAMIS CODA ... the base model has an MSRP of under $600US. The more expensive versions have disc brakes (if you really think you need one).
I'm not sure that I would commute 3 miles on a bicycle if the temps were near 0ºF ... how long is your anticipated commute going to be?
If I knew that I was going to be commuting/riding in temps below 20ºF then I would want LOOSE BEARINGS in my hubs & BB which I would repack with the lightest grease that I could find (e.g., ENGLUND'S SLICK HONEY) and plan on repacking them every week.