What skills next. Avenger

[Sirbub]

I am a 40 avenger and this is my skills so far.

4 zeal
1 vengance-left click
10 resist cold
9 resist fire
2 resist cold
10 holy shield
1 conviction-Main aura-right click

What I am wonder is what should I pump next. What I am thinking is damge first, resist cold/fireghtning to 10 (for mana reasions) then vengance to 20 then conviction. I gess my problem is when to pump conviction over damge. I have heard that NM you should be 50+ and 75+ for Hell and I am trying to get my skill so I can be effective in late NM and in hell.

Thanks again
Sirbub