So have heard that in 3.3 the 2 set increases resilience by 150 and the 4 set has the same tooltip but also increases your AP by 150 or SP by 88.
Currently I am using T9.5 gloves and shoulders for the 2 set bonus (6% more arp in battlestance) and run with just over 700 resilience. I am not sure whether swapping the gloves or shoulders out for the 4 piece arena bonus in 3.3 is the right idea, as not only will I lose 6% arp but all the other + damage stats the PvE gear has. The gain in resilience will be nice ofc but how important is survival in 3s and 2s? I have always beleived 700 res to be about right as otherwise you end up lacking too much burst. Movement is king also however so the decreased CD on intercept can only be useful for getting around.
I seem to have answered my own question here but any other insights would be awesome