meh, after about 13k hp and 493 resilience you're better off putting in some spelldmg gems. Consider putting the meta gem that has a chance of reducing your next spell's casting speed by half on spellcast.

If you want to discuss the optimum warlock health, shadowdmg, resilience, etc, go to the warlock forums and ask Shadowborne. He's a gladiator, from Stormscale, and overall a nice guy.

My warlock has 12.3k, 449 resilience and 1068 shadowdmg as affliction spec, 12.8k hp 1200 shadowdmg as demonology (due to the demonic knowledge buff).