Honestly, I'm looking at the X7-00; C7; E7; N8 specifications and I can't see any main differences.
They all have: The same CPU, same RAM, same GPU, same Bluetooth, same 8MP camera (except N8), same Operating System and so on... There almost no differences, the same hardware just other mix of it.
Nokia were quite optimistic by pricing those phones this way. I guess the only ones who will pre-order these are Nokia fans.
All Nokia phones are always way too expensive on launch time.
Nokia N8 was like 450-499 EUR one year ago. Now i could get one for 350 EUR. Which is how much it should cost in the first place...