I'm currently riding an old 2004/05 Giant OCR1 and it's too small (plus I want a pretty new bike.) I'm on a budget so I'm going to have to buy used. I know it all comes down to fit but I'd love to hear your opinion.
They all fit pretty well so at this point, so I'm stalking craigslist.

If I do a Dolce, it will be the top model with either 105 or Sram apex. If I do the Ruby, it will be the bottom model with Tiagra. The ZW6 also has tiagra.

I can't find any reviews about the Felt ZW6 so if you have any thoughts, please let me know!

Should I do the dolce (aluminum frame) with better components, or a carbon frame (ruby or ZW6 with crappy components?

I'm new to riding and doing about 20 miles a day. I have yet to do more than 30 but I am getting pretty serious about it.

THANKS!