For those unfamiliar, a staple skill is a skill that most builds will incorporate. This excludes very thematic builds that must use a bunch of different things to achieve their goal.
The initial, main 3 that jump out at me first are:
1) Mantra of Conviction - Overawe
2) Breath of Heaven - Blazing Wrath
3) Deadly Reach - Foresight
These are easy all-around damage buffs, so most builds will use at least 2 if not all 3. Obviously, if 2 Monks are in your game, one would use MoC and the other would use one of the other Mantras.
As far as adding more, it gets tricky. Some may consider Sweeping Wind a staple, splashable skill -- it's easy to have the spirit before a fight, and in harder difficulties or versus bosses, the damage is constant and free.
In PvP, other skills come into play. In PvP, I would consider Serenity a staple; some would consider Seven Sided Strike, perhaps runed for Sudden Assault, a staple.
People have been posting builds for a long time, and excluding things like "WoL spam" or "tank monk," almost every build uses those top 3 skills -- and with good reason. You could even create a skeleton PvE build like this: http://us.battle.net/d3/en/calculato....b..Xk!!.c..ba
I'm not sold on Deadly Reach. I tend not to find room for it in most of my builds I've been laying out.
I would however say that every build should have Fist of thunder with the thunder clap rune OR dashing strike... OR maybe tempest rush... Mobility is one of the staples of diablo play, and is the biggest difference maker IMHO. I tend to love the spirit dump skills so i often only have 1 spirit generator so i often go with fist of thunder.
Also anyone in a group should pick up the guiding light passive to go with breath of heaven-blazing wrath.
I only have one of these in my current build, which is Overawe. But I might not even stick with Overawe if it is too hard to stay alive Inferno. As for the other two... these are all damage adds. Damage adds shouldn't dominate your build in my opinion. You can have some of these skills, but I don't know if I would gamble with all three and give up that much defense. If I am able to hold on to Overawe, then I'd rather have Serenity-Peaceful Repose over BoH-Blazing Wrath. It's the same healing but for far less spirit (10 compared to 25), and I'm trading away an impressive 15% damage buff for 45 seconds... but I'm getting 3 seconds of immunity and I can break all movement-impairing effects. I consider Peaceful Repose to be a staple skill, actually.
As for Foresight... I actually like Foresight, I'm just having trouble fitting it. I really like Breaking Wave as my other damage add... it is only a 10% damage add but I feel like I'll be using CW as my main generator. I'm pretty happy with SW, DS, and 7SS as my other 3 actives. If I could bring myself to part with one of them, Foresight would look pretty attractive. Right now I just can't seem to find a way to fit 2 generators.
I think Blazing Wrath is definately number 1 there since every build wants to have a heal with a free damage buff imo. I think pretty much every build will take Blazing Wrath unless it really needs 6 other specific skills to work.
The other two not so much as there will be plenty of builds that benefit more from other Spirit Generators and Mantra's.
In beta i used Deadly Reach to attack from a distance by standing in place.
Something like this should be a lot of fun: http://us.battle.net/d3/en/calculato...XYk!VbX!cccbca
Cast Blazing Wrath for +15% damage, use Foresight for spirit generation and +18% damage, walk up to the largest enemy, cast Faith in the Light (Blinding Flash) to deal additional 30% weapon damage per hit, tag the monster with Essence Burn, pop Overawe for +48% damage and then cast Fulminating Strike.
That's (1 + 0.15 + 0.18 + 0.48)*7*(1.11 + 0.3) = 1.81*7*1.41 = ~1886% weapon damage as single-target damage,
1.81*7*1.11 = ~1406% weapon damage as AoE,
followed by multiple boosted Essence Burn procs as enemies explode one after the other in the middle of your combo.
I'm actually anticipating that the level of concern for mobility in PVE will be directly proportional to the level of difficulty. In the later difficulties I doubt that the gameplay will be as easy as walking up to enemies, letting them clump around you, and proceeding to let you live long enough to do massive AOE damage to them. I think its far more likely that you will need to prioritize threats and quickly eliminate them. Having A mobility skill may be necessary for succeeding in that task. But maybe my wow days have biased me, as blizzard loved to design fights that required movement.