IMHO carbon is more or less for guys who like to race. If you're going to invest in a carbon bike, then it should be top notch. If you're thinking about buying a top notch carbon bike, that means you have the capacity to buy titanium. If you're not racing why not prefer titanium to carbon.

I could see it, if you've ridden both, but just prefer the ride of the carbon. However, have you tried them both?

I'd recommend the following:

1) The Giant TCR Advanced 0 ~ $4550
www.giantbicycles.com/en-us/bikes/model/tcr.advanced/9006/48836/

2) The Giant Defy Advanced 0 ~ $4550
www.giantbicycles.com/en-us/bikes/model/defy.advanced/9012/48847/

3) The Giant TCR Composite ~ $2400
www.giantbicycles.com/en-us/bikes/model/tcr.composite/9007/48839/

4) The Giant Defy Composite ~ $2400
www.giantbicycles.com/en-us/bikes/model/defy.composite/9013/48850/

5) The Motobecane LeChamp Fire ~ $1900
www.bikesdirect.com/products/motobecane/lechamp_fire.htm

6) The Motobecane LeChamp Titanium Fire Force ~ $2100
www.bikesdirect.com/products/motobecane/lechamp_ti_fire_force.htm

7) The Motobecane LeChamp SL Titanium ~ $2100
www.bikesdirect.com/products/motobecane/lechamp_slti_xi.htm

8) The Motobecane Immortal Inferno ~ $2500
www.bikesdirect.com/products/motobecane/immortal_inferno.htm

9) The Lynskey Sportive Sram Rival ~ $2950
www.lynskeyperformance.com/store/sportive-complete-with-sram-apex-or-sram-rival.html

10) The Jamis Quest ~ $1800
www.jamisbikes.com/usa/thebikes/road/quest/12_quest.html

* The Jamis Quest is made of 631 chromoly steel. One of the lighest of chromoly steels, ever known to mankind.

PS.

A man's word is just as good as the man. A bicycle manufacturer's warranty is just as good as the manufacturer.

That said, an online warranty should always be regarded with less sincerity than one from a LBS, where a dealer has to represent both himself, as well as the product that he sells for the manufacturer.