I thought you mentioned on your other thread the frame was too small for you anyway, and you plan to get rid of it.
DO THAT. Don't fluff around spending money on a frame too small because 6 months down the track you will be back on Bike Forum asking what road bike should I get. (happens all the time)
I think just get over to your local Giant / Trek dealer (same factory) and have a look at this or similar.
http://www.giant.co.jp/giant13/bike_...?p_id=00000039
Don't waste your money on anything less than Tiagra, if you are buying new.