OK, then a good set of Velocity Deep V's, hand built with Tiagra Hubs, will set you back another $350 or so, then you need to get dérailleurs, shifters or brifters, saddle, but you could transfer SOME of that from your Schwinn.
If you build from scratch with new parts from this frame, you'll be up around the $800.00 mark for a 2006 model.
Take a look at
Craigs List for your area, you can likely find a better deal.
EDIT: Take note: I found a 06 Fuji Roubaix Pro that sold on Ebay for $1025.00, FWIW.