My dervish has seen too much downtime so I'm not the best person to give you advice. AFAIK Jason and Steelman would be some of the people you could ask for builds. Let's hope they spot this thread, otherwise just whisp them if you catch them online. Anyway I'll give it a shot to try to get some discussion going.
The word around is that Avatar of Balthazar builds make your dervish look awesome and is somewhat useful for running but apart from that is might not be worth of your elite slot. It sounds like BS at first until you realise that all the other avatars or dervish elite skills have one strong characteristic while AoB only has increased armor and running speed (not even attacking speed) which is a bit short for an elite.
Avatar of Dwayna, Melandru or Lissa are more popular atm. Melandru's is very good because of the condition immunity and the extra life that makes Chilling Victory and Victorius Sweep so much more useful. Avatar of Dwayna gives you a nice health boost and hex removal, making your dervish one tough ass mother. It's very useful for solo farming. Red Steelman goes around with a AoD build - ask him for some pointers. Avatar of Lyssa is great against casters due to the extra damage against foes using skills, especially ritualists and elementalists. Bring something to increase attack speed, like Heart of Fury and you can make their life miserable.
Avatar of Grenth used to be the sh*t (hit=enchantment removal) but was nerfed to oblivion and now does something else entirely. I have no experience with it's recent incarnation but it does not look like anything worthwhile.
Other elites...
Combining Chilling victory, Reaper's Sweep (elite) and Victorius Sweep gives one massive spike and can kill stuff pronto. Wounding strike (elite) is also excellent.
Ebon Dust Aura is a great skill for spreading blindness in PvP but I'm not sure it is that useful in PvE.
Recently, I've seen a few people using Pious Renewal as energy and health management.
That's all I can squeeze from my head atm. I hope some of it is useful.