Lens advice (very urgent)? I have D700 and those Nikon lenses

I have D700 and those Nikon lenses…

Primes:
50mm f1.4
60mm f2.8
85mm f1.4

Zoom:
14-24 f2.8
24-70 f2.8
70-200 f2.8

And now planning to buy a 24mm 1.4
and 200-400 f4 for different purposes…
Does anybody using them here?

Do they have any cheaper alternatives?

From your list you are obviously an experience photographer with the top lenses Nikon makes. Every lens in your list is a top level professional (and expensive) lens.

I do not think you will be happy with cheaper alternatives.
I can give you a couple ideas: Get the 300mm F4 AFS, instead of the 200-400 zoom. Yes, you lose VR and zoom. But you won't lose much range, and it's a fifth of the price.

Regarding the 24mm. You really need a 24mm f1.4? You are pretty much covered by the 14-24 which is superb. Think about the 10.5mm 2.8 fisheye. This will give you something you do not have at all, it DOES have straight lines when held parallel, and is a 1/4 of the price of the 24mm.

There's no cheaper alternative to the 24mm f/1.4. Nobody else makes one for the Nikon mount. If you need 24mm f/1.4 you'll have to buy Nikon's.