What I would say is you really need a streamer, purpose built for streaming digital audio and that is all it does so the processor is not taken up with other tasks that a PC has. If you heard a good streamer hooked up to your system you would hear a night and day difference. Get a good dealer who has three or four streamers in your price range and have a good listen. The only good PCs for streaming are ones purpose built for the task and believe me those are worth more than a first streamer.
Hope you get some more positive answers from some of the crowd here. Good luck, Jim.