seriously, get the Cayne frame and build it up Dude. Don't buy a bike then swap out parts right away. If you buy the bike complete, replace the parts has they wear out. My bike above cost me @600 total but has Deep V's with Formula hubs rear is fixed/fixed, Milwaukee 17t cog and lockring, Sugino BB and cranks with Salsa 45t ring. Selle Flite saddle, Ritchey post, Forte stem, Nashbar bullhorns, Cayne creek crosstop lever and Shimano Tiagra brake. Nothing fancy but a lot better than buying a bike and then stripping it down.

EDIT: just weighed my bike. Comes in at 19.1#. Will be lighter when I swap out the deep v's for Cane Creeks by a pound or 2.