Meh I don't like Air Magic... I don't think 25% armor penetration is enough, especially since Obsidian Flame and Teinai's Crystals ignore armor completely.
But anyway, my Geomancer has Obsidian Flame, Teinai's Crystals, Dragon's Stomp, and Armor of Earth. Pretty basic stuff; I like using spells that cause exhaustion because those really take advantage of the elemental's large energy pool; also I prefer Armor of Earth over Silver Armor because I don't like probabilities and the effect is longer so I can rely on it no matter what happens. I also have Ether Feast for some energy stealing. When I look at my 5 Energy spells and then see Stone Daggers, I'm just not impressed; my Wand can do 1/3 of that damage for 0 Energy and I'm good with that. My last 3 skills are the two elem glyphs and a rez/cap.

I swich up builds with my ele all the time.  It all depends on the type of creatures I am fighting and the region.  I switch between fire, water and air.  I don't use earth.  I'll use fire or air build on water based creatures.  I use water or air on fire based creatures depending on the effect I want to use on them.  Some skills work every well when mixed and you deal even more damage.  Don't be afraid to experiement.  When I do builds I go to a website that actually has a listing of the skills and what they do.  I read through them and try to measure there effect and then I take my build from there.  It's helped me a lot.  http://www.guild-hall.net/elem.php

Ive been liking the new Searing Flames build

Atts:
fire     max
earth 
es     

Skills:
Searing Flames[e]
Glowing Gaze
Glyph of Lesser Energy
Fire Attune
Aura of Rest

For more defense (E/Me) with geomancer type armor
Stone Striker
Mantra of Earth
Ward vs Melee

For more evasiveness (E/R)
Serpents Quickness
Natural Slide

of course you can tweak this to fit your style