Monitor, audio, Rift configuration advice

I recently bought a new 4k tv for gaming and realized that my yamaha receiver was limited to a 4k@30hz pass. I have a gtx1080 feeding my receiver through the DVI port and had to go straight from the HDMI to the TV to achieve 60hz so now i'm left with nowhere to plug my Rift. my question is, given my current hardware limitations, should I buy a cheap DP to hdmi for the audio, an expensive high quality DP to HDMI for the TV or a DP to HDMI adapter for the rift. I get full color as it is through the HDMI port on the card but am left trying to figure out the best option for my setup. any thoughts?
 
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