Setup question


A brief setup question if someone doesn’t mind helping me out. In my family room, I currently have a 5.1 setup with a HK AV receiver, 2 JBL towers and JBL everything else (which will be upgraded to PSB sooner than later). I wanted to add vinyl to my family room setup but my receiver does not have phono in. I bought a nice Rotel turntable and NAD amp that can be used as a pre, power or integrated amp.

My question is, what is the best utilization of this equipment? Should I go turntable > NAD (pre) >HK? Or should I go turntable>NAD (integrated) >speakers and use the speakers for both setups with a switch?

Thank you in advance for your help.
128x128eli_tackla
Great! For TV use get a budget DAC with optical input. What digital outputs are available from the cable box? If it has coax there are many DACs with optical and coax inputs to serve both units. 
@mesch thank you again for the help..and everybody else as well. The cable box actually has optical and rca out so that's not an issue. I'm more concerned with either/both the optical out from the TV for the apps or the optical out from my Xbox for the same reason.
When you say the cable box has RCA out, do you mean dual RCAs analog output or single coax digital out? 
If you intend on using the analog output on the cable box then you only need a toslink optical input DAC for your TV, once you set the TV output to digital-PCM.  Many inexpensive ones can be found on Ebay. I once used one by MUSE, cost was ~$25. Just make sure it has optical input. 

Are you still considering upgrading your speakers?