take expertise out of pvp gear and put it in pvp valor level . the more valor ( pvp level ) you have the more expertise , no more problems of pve gear dominating pvp .
or make it a pve stat . pvp and pve sets equal but t1 pve ,t2 pve etc progress not in stats but in expertise .
that way a pvp and a pve set are equal in stats but the pve people get a incentive to get other pve tiers because they give more expertise ( that would only work against NPC's ) and make those pve sets look better for the show-off's .