Seneca V vs. Navajo operating costs

Hello,

From your own experience, could you tell me approx. direct hour cost
for Navajo and Seneca V?

Is Navajo much more expensive than Seneca?

Any comments about Seneca's anti-ice system?

And another question: Is buying Seneca V from 1997 with about 650hours
on airframe and engines good idea?

Thank you

Best Regards
Jarema