A 50 foot run can be a gamble. Not only does it depend on the quality of the cables, but also the equipment that will be at both ends. Is this a cable you will be installing during a pre wiring stage ? If possible, you might want to first do a bench test, stretch out the cable and go ahead and hook up the equipment it will be used with in the final project. See if it passes the "proofs in the pudding" test. This may reduce any regret in your cable choice later. I have had problems with higher end cables not working well at 35'. Just because you can find cables at 40, 50 .... 75+ feet does not mean they will work without some kind of aid.
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