Soliuz - Let me first say Congrats with you top 100 ELO finish and your Kiki Cr award. I think your the first American to win an old Cr since LittleTK. Awesome job!
As far as Kiki Cr goes, I don't think there is a definitive price. It all depends on how many sells are on the market and with the old Crs, there is usually not many. You're not going to get a correct answer here since their really isn't one. If you are looking to trade him for another Cr, your best bet would be to post a message on the French forum.
Just saw that you put him up for sale at 4.5 million, which seems reasonable to me. Again, congrats!
You can have definetely 3 millions in ctz and more if you want to trade it for others cr cards I would say 4millions in others cr cards. You can also trade your Kiki Cr 0xp against a full one and 100k ctz easily... you can have Lyse Teria Cr or DJ Korr Cr without too much problems if you didn't level it up...