i'm near complete act2 inferno on my demon hunter and it's tough, basically in the first act i was getting one shotted, so i said f-it, i'm going all offensive. So through upgrades the biggest dps bow i can get is a 960, and i just run through nuking stuff, now i'm focusin on +discipline, it sounds silly to do for gear, but it lets me become invuln, more and longer, so instead of getting lots of gear to survive 2 hits, i just focus on dps and try to get invuln, it works well i think, i just a swarm of those horrible shielding/fast/regen... whatever mobs so i just stand there, have my enchanter (i like her cuz she turns mobs into chickens) do some cc, and i just spam invuln, recover, spam invuln, and nuke it all. Gets fustrating tho, i only play 10minutes at a time since i die so often.
i've now gotten to the point that i take off all my gear except my boots and run around to find the waypoint or where i have to go, ha.