If the 35 and 85 is doing what you need right now... then why buy another lens?
You don't seem to want longer (as you questioned what the 70-200 FL would be good for). You're not sure if 24's too close to the 35. It just sounds to me you're "content," and that's not to say it's a bad state to be in.
But there's always ways to spend your money. You can always cough up a liver and go for the 14L (since you're big on primes). There's the 16-35 if you don't mind zooms. (16's not anywhere too close to 35.)
However, looks like you should avoid the telephotos since weight seems to bother you.
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