I would take Rice and Kante in a midfield, depending on what we are playing ahead of them. Kova is a strange one, I watch him sometimes and he is technically so gifted, but so underwhelming at the same time, he could be so much more than he is. There were times I saw Kova and thought it was Hazard, his close control and tight space play is insane, but would I pick him over Jorg? Honestly no, even for Jorgi's faults, he is more valuable to the team. I rate Kova, I really do, he is just under whelming for me, in a sense that I feel he could do SO much more.
Hopefully I've explained that correctly, I'm not bashing Kova.
~edit~ Correct, £70m is an insane price, considering the current market. £50m tops.