As gets stated in every post about disc brakes on CX bikes, they are not allowed in UCI races. So if you think you might race, don't get them. If not, then I gotta say disc brakes are nice. I've got Juicy 7s on my MTB and I would never go back to any kind of rim brake except on my standard road bike. No more wear on rims, so they should last a lifetime (factor that in to your price). Rotors are much cheaper to replace. During wet periods, canti/vbrake pads get imbedded with sand/grit and grind away and make much noise. I have to pull the pads out fairly frequently to clean out the pads.
I must say though that $1650 is pretty steep. Seems like $1500 is a better price.