Wow, nice timing. I just test-rode a Ruby Elite - literally an hour and a half ago. And fell in love. It's all I can do not to call the bike shop with a credit card number...I figure waiting a day before these kinds of purchases is a good idea. (I also fell in love with the LBS, but that's another story.)

The difference between the Elite and the Dolce are the frame material. Elite-carbon; Dolce-aluminium. I think you can get them with different components too. (I tried one with SRAM Apex.) Not sure about the other two, but I'm about to dive into the Specialized site.