I know I push this a lot, but if you like the feel-good-ness you get from buying a Cannonball made right here in the US for $300-500 more than you should, then by all means go right ahead, but if you want to get the most for your money, look at Fuji, Felt, and the others you mentioned [specialized is good]
Now, here's a roubaix for you... the Fuji Roubaix!
Tiagra shifters, 105 derailleurs, one of the cheapest bikes you'll find with carbon seat stays and a carbon fork. The carbon seat stays aren't necessarily to save weight either [they actually make the bike weight a little more] Instead, the flexibility of the carbon makes for a smoother ride. All the Fujis come with nice Continental Ultrasport tires. The Truvativ Triple crankset is a good design and uses the hollow bottom bracket with external bearings.
Price - $999
Here's another, the Felt F80
This is what I ride, because it's what I could afford. I have since upgraded the heavy crank and bottom bracket to a Shimano R700 compact with Dura-Ace bottom bracket. This bike is 9-speed 105 from the shifters to the derailleurs. Like the Fuji, this one has a carbon fiber fork. The shifters and front derailleur are better on this bike whereas the frame, crank, and wheels are better on the fuji. The Fuji Roubaix is a bit lighter as well.
Price - $799
Here's your step up from the Roubaix - the Roubaix Pro!
Here you get a few advantages over the Roubaix. The shifters are 105 10 speed, the front derailleur is 105 and the rear is Ultegra. The crankset and wheels are also a nice upgrade. I know that wheelset uses a genuine Shimano rear hub and cassette body, which is a good thing! So, with this bike, you go from 9-speed rear to 10-speed with the nice Ultegra derailleur
Price - about $1200
Here is the Felt equivalent, the F75
This has an even better crank than the Fuji counterpart and shares the same platform of 10-speed Shimano 105 shifters and Ultegra rear derailleur. This bike has the carbon fiber rear seat stays just as the Roubaix like does. This bike has a nicer Shimano wheelset.
Price - $1299
Now, you get to find out you can go to a full carbon fiber frame without having to spend $2000. Here is the Fuji Team!
This bike is essentially the Roubaix Pro with a nice full carbon frame. 10-speed 105 shifters, Ultegra rear derailleur, and of course a full carbon frame! This will be my next bike!
Even the price is good - $1599
If you wanna go above that, just let me know.