Given everyone's recommendations, I am ogling three bikes (my best estimate at specs on a 54 cm bike)
Redline Conquest Pro Carbon (BB drop 70mm, weight 1230 grams, SRAM Rival/Apex Groupo)
Specialized Crux Pro Carbon (BB drop 69mm, weight 1000 grams, SRAM Rival Groupo)
Cannondale SuperX Carbon Rival (BB drop 67 mm, weight 1400 grams, SRAM Rival groupo)

For brakes, what would be your ultimate recommendation for using on 2 sets of wheels:
Disc wheelsets for both road and cross riding
Just keep a good canti for both
Upgrade to a mini-v brake for both

Which would
a) take the least amount of dealing when changing wheelsets?
b) be the best compromise for mud clearing in cross races and feathering when drafting on a road and just generally being able to actually stop the bike (unlike my current cantis)?

Or, I wonder, if I could just swap tires, and cross race on a decent set of road rims (I weight 140 lbs)?

Again, thanks for everyone's input!