I'm wondering why you think you need a bike with 105/ Ultegra/ Dura-Ace(!) components. Even for a beginner racer, nothing above 105 is at all required (actually, some people race on Sora just fine, but don't tell the bike snobs). You will have absolutely no flexibility to lock this bike up outside for fear of it being stolen. Any thief that knows even the basics of road bikes will immediately see the 105 rear dérailleur and target this bike if at all possible. Also, consider that this is a huge leap up from your trek. Huge! However, any new bike for about 600 dollars and up is going to feel excellent in comparison, so I'd really question why you need a bike like this. Not only that, but it's pretty impractical. The carbon seatstays and seatpost prevent you from attaching a rack even if you did have room in the first place, which don't anyways, and anything other than raceblade fenders are probably out of the question. Don't get me wrong, it's a great bike, it's just more than you need in a lot of areas, without some key pieces that would make it a great commuter.
I own a Jamis Aurora, the bike mentioned by an above poster, and I would highly recommend it. It's a road touring bike, and it will still feel a ton faster and even lighter than your current bike. However, since it is a touring bike it is sturdy, and has the ability to mount larger wheels, fenders, both front and back racks, etcetera. A similar bike is the Surly Cross-Check, which is very similar bt is technically a Cyclocross bike. Ditto the Bianchi Volpe.
I completely understand the hungering for a new bike, but it's important to understand that though they may be marketed heavily, a lot of road bikes are simply ill-suited to everyday use.