Fire Aura plays quite similarly to regen as most of your survivability is with healing flames. There is also good synergy with 2 self heals and 2 endurance recovey powers if you chose to take them. Fiery embrace will also help with burst damage and could be quite effective.
Energy Aura has the defence to go with the -acc but wouldnt be much of a pve toon.
Elec armour has nice resitances and the self heal from DM could be useful but no real synergy just that elec is a great set 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
I have a lowbie dm/fire thats a blast to play. Fraid I dont know how it would go in pvp though.
My MA IDs:
Fiend Space: 211464
Oh well changed my mind in the end and went for the rather too common EM/Elec. Currently enjoying it at lvl7 ish
lol :P
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
DM/Energy woulda been better, got one to 40 and since overload i've never been killed in Pvp and hardly ever die in pve
It's now Issue 21 and I am back!
My new Global is @Zyhar
Currently enjoying the Exalted Server!
As I have lots of play time on a DM/Rgn scrapper I figured something similar in Villainous form would be nice. I don't like DA and though I like Stone I don't like the lack of speed so thats out too.
So reasonable PvE but will be good in PvP?