Leap Slam Staff build

My passive tree:


The skills I am definitely taking are:
- leap slam
- molten strike
- enduring cry

I won't use all of these but these supports are the ones I'm thinking of using:
- Added fire/ice/lightning damage
- fire/ice/lighting pen
- Melee Physical Damage
- Culling Strike
- Faster attacks
- Life gain/leech
- Stun

Other skills I am thinking of getting:
- Glacial Hammer
- Ground Slam
- Infernal blow

I think it looks alright, but I'd like some feedback:
- Is it worth putting some points in stun without being a full stun character?
- Am i tanky enough? (resists, health etc)
- Is leap slam a good enough AoE or should I also take ground slam?
- Should I use all three elements or just one?
> If just one, which one and why?
- Are there any mobs this build might have trouble with, and how could i adjust my build to deal with them?

I would appreciate any and all feedback :)

I have a pretty similar build right now at lvl 41.

my mainattacks are

- heavy-strike (with melee-damage/lightning-damage) -> single target
- sweep (w. fire-dmg/chance to ignite/cold-damage) -> crowds
- leap slam (w.o. support) -> just for movement
- molten shell (w. fire penetration)

i am using enduring cry and warlords mark - both help a lot to survive. most of the time in combat i stand in the middle of 5 mobs, which are eating through my shell while i am casting Enduring cry and Warlords mark and then sweep the final rest of life out of the bad guys. until here it works and means fun.

Auras:

- wrath & discipline

i am at akt 1 cruel and have 870 life and 200 ES right now. i would recommend you to take the 30% crit-reduce from mara + troll-blood for 1,5% regeneration.

i am defintive missing some mana. my molten shell costs 66 mana right now - it can be hard to recast.

my equip:





my skilltree:

http://www.pathofexile.com/passive-skill-tree/AAAAAgUAAnEEswVbD1QUTRkuJ-02ujwtRHJG10ouTP9USV3GXz9gbXKpfNl9U4FvgziExIp0iuSb7J2AogCnpalorKqvbLaGuUO53cQVxPbFitSP3fPnUu1E7w7vfPAf8i_ynA==

regarding some of your Qs:

- i would rather take one or max. two elements. with RT you dont benefit that much from status ailments, so you need chance to ignite or similar tricks. fire seems a good choice with the +30% extra-fire node below mara-starter area. and added fire gems work percentage-based which fits better with a phys.-dmg-char.
- i dont go into stun too deep. but that doesnt mean its worthless.
- i could definitely need a little chunk of more life - but who in this game doesnt?
- i think leapslam is cool - but i would rather go for sweep or groundslam, just becaus the animation of LS is so slow with enemys close by.

bump