go with earth/nrg, grav/nrg, or mind/nrg.
PFF will not save your life like it did before or like it does in PvE but the mace debuff is very good and will give you the advantage in most 1on1 or spike situations.
I found that mace is nice still for pvp, granted pff isn't the auto i live button anymore like it used to be( many people tend to miss me alot on my mind/elec when i'm in pff still).
I am not sure about a dom's HP cap but i have mine at 1400'ish atm, gather it can get a bit higher.
Don't take plant for pvp, granted it has some nice utilities, its definitely a more aoe/pve friendly set.
I would definitely say earth/nrg or mind/nrg are sound for pvp(earth has real nice synergy with nrg due to nrg not having aim or BU and earth debuffing def)
/elec has build up /nrg doesn't, but with the i15 dom buffs to /nrg it should make it more on par with other sets, plus /nrg has alot of KB, which rocks in pvp atm.
i decided on earth/energy
What are the skippable powers from both sets?
Stone Cages in Earth Control is skippable. Quicksand is excellent at keeping enemies in one spot and it doesn't stop the KD of earthquake or the KB of energy. Both of which are excellent damage mitigation.
The snipe is questionable. Pretty skippable.
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How will /energy perform in RV? will it be competitive with /elec. I plan to be plant/ if that helps
i have a ice/thorns dom in RV atm and its kinda rough, i miss a lot even on blasters and trollers. i was wondering if getting mace mastery for the shield and pff would be a good idea. on my ice dom i have mako and its not fun always getting hit
i have gotten 1200 hp on my ice/thorns dom so far, how much hp can a dom reach?
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1606.4hp Link
Make sure and get( Born in Battle, Highpain Threshold,Invader)the HP accolades.Those will add 200ish to your hp depending on the io bonuses you run. Its a good idea to start working on a few of the badge requirements early since a few are booger's to get.The biggest booger being the last tier damage taken badge. Good luck with your domi 
How will /energy perform in RV? will it be competitive with /elec. I plan to be plant/ if that helps
i have a ice/thorns dom in RV atm and its kinda rough, i miss a lot even on blasters and trollers. i was wondering if getting mace mastery for the shield and pff would be a good idea. on my ice dom i have mako and its not fun always getting hit
i have gotten 1200 hp on my ice/thorns dom so far, how much hp can a dom reach?