I have a PSR-E453 that I have paid 240€ here in France and it's a great keyboard for the price. It has a pitch-bend wheel, USB to Host Midi but also audio, a USB port, 2 knobs for live control, DJ features, etc... that the CT-X700 has not. The CT-X800, that has a pitch-bend wheel and an USB port is more comparable to the E453. Now there is the new E463 that add sampling features but will be more expensive.
What I love in the E453 is that it has a better "perceived quality" than the Casios. I have a Casio MZ-X300 that I love too, but the aspect of the plastics are a bit better on the PSR.
I can't say if the CT-X700 has better sounds, but I'm sure it's the case. The PSR-E453 has some great "sweat" and "cool" sounds, but most of the other sounds are very common and remind me of the 90's.