Significantly lighter?
Well if you got the eclat seat&seatpost combo, theres prolly half a pound to a pound.
Get KHE Street tires or Tioga Powerblock and theres another pound
Get Odyssey Race Forks and theres maybe a third of a pound
Get new wheels with rynolite rims and theres some white, and maybe get studs with them, and double butted spokes
And finally just say screw it and get a new, light frame