Based on the ?399 price tag at Unlocked Mobile, I would predict the 8X would cost around roughly $400 unlocked and that it would launch at $99 to free on contract at each carrier.
It doesn't really matter that the 8X will be some carriers' only WP. The carriers care about phone sales and not the OS. WP8 alone won't help the 8X fly off shelves relative to Android offerings like the One X. It may actually remain at a slight disadvantage.
Also, the 8X is only 4.3". Despite some claims that 4.3" is large enough for a "flagship", consumers are still unlikely to pay more for a smaller device. (Just because I'm full from a 6" Subway doesn't mean I'll pay the same price as the 12".) Galaxy Note > Galaxy S for a reason.
$200 for the 8X is too high a prediction, especially when we already know the European prices. The 8X should be the Lumia 710 of WP8.
(I realize that this may appear competitive pricing prediction for a phone with a Snapdragon S4; but, we are right before the launch of S4 Pro. Also, similar to the Lumia 710, WP have always had extremely competitive specs at midrange prices.)