Me? I'd get the X1C.... Better KB hands down.... Unless you don't dig the X1C nub and old school buttons above the trackpad that is. If that's the case then you'd also have to rule out the X1 Yoga....
Do you want a 2 in 1? If so you are down to 2 choice and of them I'd get the X1 Yoga but I dig the nub....
The 930C is a fantastic value for what you get but the KB is not as good as the X1C...