I almost have to disagree with you Jaetch that life steal weapon is optional to do MP10.
Sure if you have 500k+ dps then 1.5% life steal from blood magic may do the job but if you are like me sitting between 300-400k dps.. life steal weapon is a must i feel to move up the MP brackets...
Well, yeah, but nothing's really mandatory in this game. Everything is optional. Guides are more or less just recommendations if you want to go a little above and beyond.
Life steal is easy mode (and yes, because we feel like we're cheating with a life steal weapon + Blood Magic, that's why it looks like LS will be on its way out in the future), but you can get by with just Blood Magic. Remember I did run strictly Blood Magic for a while and I had like 400K buffed DPS. But during that time I had over double the EHP I currently have. It's all about balancing.
i just dediced to start playing again this game. since new patch is on its way, anyone got some suggestions on what gear should i buy from ah? when it still is available. really lack resistance can't even kill some of elites in mp4. or should i try some other build instead of Archon?
here my current gear: http://d3up.com/b/1224307
Your amulet, rare ring The Seal, and your gloves should be the first place to start I'd suggest. If you're going to use Strongarm Bracer's (which are nice) you can find a pair with All Res for not that much on the AH as well. I'd say possibly some Ice Climbers if you're going to keep the Unity ring. Life + Socket + Mainstat + High All Res. It's good to maintain an All Res of a minimum of ~500 from my experience. Any lower and the reverse effect of diminishing returns hits ya.
I ran a barb on MP10 for a while that had 329 all res, didn't die 99% of the time. Had a sweet HOTA/Threatening Shout build with Leap too, and ooo say anywhere from 108-125k life depending on the gear I swapped around. Even still if I didn't avoid death sitting in some pools of Plagued or too much fire would eat that down like you won't believe.
Too bad I didn't read this earlier today, I just had a ragequit and dumped my entire Wiz and Barb to a friend or I could have helped ya out a bit more.