Thanks for the advice all! I actually think I have a pretty solid starting point gear-wise, I just need to gem it all up (unfortunately I don't have any obsidians though). Besides HP, what other stats are useful? HP on hit? Regen? Do they have any place in arena? Is there a good mythic energy source for a gun rogue in PvP?
Also, before I start blowing gems, I kind of want to plan out my gear a little. I see people use Empyrean a lot? What else is primo in arena. And if I go pistol and vial, are there better special skills than the defaults? Maybe twister or orb and summon spirit thing or skulldraga?
The items I have waiting to be modded up for PvP:
Vampiric Touch, 86.9% weaken, 24.7% sprint proc, 50% bleed dmg, 25% total hp, 10% bleed chance
Haunting, 99.5% fire damage, +2 set numbers, 22.9% specialist, 8.8% resource cost, socket
Aethereal Drain, 92.3% Blistering, 97.6% fire damage, 22.3% total mp, 213 all resist, socket
Defiant, 100% fire damage, 24.8% dmg to elites, 26.1% weaken, 2 sockets
Ascendent, 387.4% explosive, 5 intelligence, 9 blindside, 19% fire damage, socket
Gladiator, 8.1% stealth proc, 20% damage to elites, 8.5% deadly strike, 181 hp on hit, +4356 fire dmg (does this work for MH as well, or just OH, which would be pointless on a vial)
Bloodless Victory (Root)
Gladiator, 11.9% clotting, 8.9% purge, 8.9% recovery, 9.3% ar piercing, +416 hp on cc
Also, do pet stats get counted in arena? If so, I feel mine is pretty dang well set up for arena...
Permafrost, +50% bleed damage, +15% attack speed, +10 bulwark, +15% crit chance, +25% total ar