When I got to the end of act 3 in nightmare, I had ~7500 life and ~1100 damage. At this point I started dying constantly, I mean like every yellow or blue monster pull meant at least 5 consecutive deaths. I was wearing the best gear I had found, so I decided to check the auction house for the first time to spend some of this cash I had saved up.
About 35K later I was at ~10,000 life and ~2700 damage. Things got much easier. Now I'm back in the same boat with dying all the time and I was wondering what the par is for each act and difficulty.
I am a 54 monk and I run around with lightning fists as a spirit generator (extra spirit on crit) and tail kick (stun) as the spender. I use the heal spell (extra healing), dodge mantra, auqa companion and aoe aura (extended range). I have 2 one handers and stack only dex and a little vitality in gear so far.