What if the EWH is out of easy reach? My CM's valor level is 12, so grinding to 50 valor and getting all the comms is not a quick or simple task. So would the Matrix Cube, the DG heal proc relic or a different non-PVP relic I'm overlooking be the next best option?
Your valor level doesn't matter, you just need RWZ and WZ comms to buy them. Easy enough to get enough of both in a few days worth of pvp, just by doing the daily/weekly.