We are a pvp guild so most of us have full war hero and some elites! Does this matter if we wear pvp gear instead of tionese gear /columi which has lower stats?
Ignore whether something is PvE or PvP - pick whichever pieces benefit you the most in regards to stats and set bonuses.
Another thing you can do if you have enough extra WZ commas - buy a WH piece just to pull the mod and enhancement, then put those in a lower tier (tionese or columi) PvE piece. Make sure to check the interwebs to make sure you're buying the mods and enhancements you like as cheaply as possible. PvP armorings suck for PvE, but the mod/enhancement from a WH piece can be as good as a Rakata or BH piece, depending on the stat allocation.