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Are you building the entire thing yourself, or is that workshop building it for you?
If you're building it I might suggest a few things, and forgive me if you've thought of them already...
Make sure you put a sturdy back panel on your desk. This will triangulate it perfectly and prevent it from parallelogramming over to the side. In my experience, wood screws can rip out of MDF fairly easily when exposed to certain stresses. Sheer is fine, and tension is okay, but when a joint gets tweaked out of 90* it all goes to pot. I recommend some strips of real wood (1"x1" or 2.5cm x 2.5cm) to go in the corners on the underside of your shelves. Screw THROUGH the MDF into this wood and you'll get a great bite.
For that top shelf, if you want to avoid the middle post, span the edge on the front and rear with some angle iron. That'll be enough to prevent bowing and give you more flexibility on what to place underneath it.
Good luck with your desk, and don't forget speaker stands! 
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