I am trying to decide whether to purchase the new canon 70-200 2.8 is II or the 200 2.8 II prime and with the rest of the money maybe to get a used canon 1Ds mk II as a 2nd body or some elinchrom BX 500 Ri lights. Please help me decide 
I am a wedding photographer based in Iasi, Romania. You can see my work here
to understand my style of photography.
Currently I own a canon 50D, canon 17-55 2.8 is, canon 85 1.8, canon 580 ex II, nissin Di622, umbrellas, stands and so on. When needed I borrow from a friend a tokina 11-16 2.8 and canon 135 2.0.
If I get the 70-200 2.8 is II, the 85 prime would not be that useful anymore so I would sell it. I like my 85. Also the zoom is quite heavy and attracts to many eyes.
On the other hand if I get the 200 prime I am afraid I would be missing the IS. My hands are not that steady I'm afraid.
Unfortunately in my country I can not rent lenses to see how both of the 2 work.
It would have been be great if a 200 2.8 is prime exist. Please help me decide

