If you can afford it, and you're going to ride it - then go for it. Bikes are meant to be ridden, and it's better to ride the bike of your dreams rather than only dream about it while you're pedaling some clunker... I know people who commute on carbon in all weather, and who cannot imagine going back to anything else.

I would, of course, first consider the practicability of this proposal. All-weather doesn't sound too bad, if you don't get snow. Dealing with rain requires more bike care, but it's doable. If the commute route is through potholed, congested streets littered with traffic lights and stop signs, I would also ask myself if I'll truly be able to get the bike's value out of riding in such an environment. My biggest concern though would be secure storage. There is exactly zero way I'd lock that bike outside for more than a handful of minutes. You're planning to bring it indoors to a secure spot, right?