OOppsss me missed the glass cannon thingy..my bad..

And If I consider myself glass cannon with 36kdps..surely ..this glass will shatter gazillion times..

20k DPS can or not? 

Which act? Assuming you need to complete the game.
20K (unbuffed) is very doable in solo. You need 6K Armor / 800AR /40K+ HP too / 600 LOH too.
If you go solo, you need to go slow as 4 elites + creeps will whack you simultaneously.
Used Sweeping Wind (Blade Storm)  and all passive and active healing skills.
Monk has so many healing skills. Any skill you use will give you HP.
Do you teleport? Use that. It helps in skipping some deadly hits.

P/S Ghom will give Monk pain in the ass.  Ghom is way tougher than Diablo the Prime Evil. It is like Barb fights Ghom without overpower (CA). Monk is slightly better with healing skills & serenity.

P/S Remember I asked about the Mantra of Healing vs Mantra of Conviction?
A1/A2, I used MoH.
A3/A4, I upgraded some of my gears & used MoC. If my memory serves me right, I had about 24-26K DPS (buffed) by the time I killed Diablo.
Play with MoH and MoC and find out yourself which suits you better.

i did a few act3 with 20k or so dps. really susah haha. takes about 4 hours to complete a siege breaker to azmodan run. not efficient at all

im aiming for 30-40k unbuffed (and maybe 700-800 all res as thats what the other pros are running with) before going down act 3 again ><