It might be cheaper to buy a bike with the components you want and either keep your Jamis for backup duty or sell it.

Your bike is a cross bike, so there may be some brake compatibility issues I'm missing too.

Having said that, I tend to alternately "upgrade" either the frame or the components... I haven't bought a new bike complete since 1992. Putting a new groupset on is not a daunting task, although it does require a few specialized tools.