i'd roll punchbag survival prot becz its simplicity, no weapon swap, no stance dance, full prot stance 24/7, with shield wall glyph for short cd, where u take blood craze on fury talent instead of impale, the gear would be focus on getting 1414 minimum resil with atleast coroded key and then full stamina, so u can 'rotate' the def cds effectively. u will deal zero damage, but the idea is to give a long annoying fight when ganker comes to u (u can still kill rogues in this build).
u can tank elites and dungeons well and deal enough dmg to help your friend, also quick rdf pop for your daily reward.
as for bg and wg, your gonna be a dmg soaker cc machine and let others do the killing job.
but u might avoid serious arena with this build for obvious reason, so thats where your might wanna spend coins for those arena pieces. mainly head and shoulder, u can use the furious ones from vote points for the weapon and the shield if u doubt to buy the wf ones cz the total resil diff is about 50ish. i mean, u can use the available honor pieces to try it first, so u can switch back to "kill before get killed" arm/prot build just incase it doesnt suit your taste.