Hi, get a 518.
That will give you 3 coax ad 1 Optical and it will also clean up your sources digitaly.

Dont buy Items with only optical outs or it forces you into a corner.

If you get a Meridian processor as well you will have at least another 'optical input' which will not benefit from the 518 treatment, but if its not so critical it will be ok.

My TV has dig coax in and out so that adds another input for me which I use with my HDDSTB.

Just my first thoughts, welcome to the slippery slope of great sounds and thin wallets.

I am sure other more knowledgable people here will chip in.

Cheers, Chris smile

No 18 in the Hall of fame smile I have simple tastes; I am content to settle for the best:
GIK monster bass panels, rear wall. QNAP TVS 471i3. Roon into DSP5200SE via 210/ 218 zone... Explorer 2. Bluesound Pulse 2, Mini & Flex. 596v1, 518, Foxsat HD, Sony BDP, Pioneer 5090, 2 Chromecast's for LRB videos. MS200 to F80 for a Roon zone