My current bike is an entry level, shimano 2300, aluminum forked, heavy ride. I got it because at the time there was no way in hell my wife was going to let me spend over a grand on a bike when i wasn't sure how much I was really going to enjoy it. Sine then I've really gotten into riding. While I still enjoy it I would like to move up to something with better components and at least a carbon fork. I figure if I'm going to spend close to $1500 for a nice aluminum frame bike might as well spend a few hundred more and go carbon fiber so I won't want to upgrade again as soon. My current bike will then become my bad weather bike and my tinkering bike, so I can learn how to do all of my own maintenance without worrying about putting my primmary bike out of commission until I can get to the LBS and pay them to fix it.
Thanks guys for your replys. I'm really looking forward to picking up this bike in the near future. I was thinking about the Tarmac too, but I think the Roubiax would be a little more comfortable and better suited for the type of riding I do.