Contact Rich of Network Acoustics and ask. He will direct you. I had the ENO system, Muon and now the Muon Pro. Each step up is a noticeable improvement. I would go for the Muon filter combo. The combo price is lower than both separately.
The cable alone is not what I would do. I would get the Muon filter and run with a decent ethernet cable like the Supra Cat 8. Get a Network Acoustics ENO or Muon cable later if you have no choice.