what do i buy i have 300 daily coms i like to pvp
Are they PVP comms or Flashpoint comms?
Are you over level 50 or under?
level 10-40 I get the level 20 and level 40 PvP armor (mostly for looks), any leftover get PVP medpacks.
level 40-50 max out ranked and normal comms to buy Warhero gear when you hit 50.
level 50+ 300 comms won't buy you anything, keep saving.
If they're flashpoint comms I don't know. I spent my free Tionese set on my healer companion for when I run missions (post 50).