I hope the recessed lights are not actually in the corners but are placed out from the corners by a foot or so. I'm not sure why you want a fixture in the middle of the room. Is the desk going to be in the middle? Consider table lamps instead on the desk and console if that's the furniture you'll be using. But if you're adamant about a chandelier, look for a 24" diameter.

Also, Edison bulbs give an amber light, so if your reason has to do with work lighting, that might not be a good choice...