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The 85 will not give you the AF snap speed and IS of the 70-200, and if you are shooting under f/2.8 with the 85 you will run increasingly into the narrow DOF, so I wouldn't be to swift in discarding the 70-200. I would add the 85 as a luxury for when you can afford it, but keep the 70-200, it's a great lens.
Depending upon how you shoot, the AF speed might not be an issue. Most weddings don't require blazing fast AF, but I've only shot the 85L once, so I don't have the experience to comment on that specific lens.
But in regards to the OP, he doesn't even use the 70-200 so he won't be missing the "AF snap" anyway.