If you are looking for a 42U rack then look closely at the APC racks, they are definitely pricier than some of the others but well worth it.
I install network equipment for a living and the APC racks are some of the best made, lots of options for cable management and shelving along with most of the edges being rolled. Rolled edges means no cut knuckles from working on your rack.
If not in a real hurry keep an eye on your local craigslist as 42U network racks do come up for sale fairly regularly in larger cities.
Sony 75X900e/Sony STR-DN-1080, CS-3/CS-8/CS5
Sony X800 4K blu-ray player/Dish Hopper3
Roku 4 Premier/Sony PS-4