Are you just playing for endgame raids? Endgame questing? Leveling?
I ran Monk 20 last life for a raid DPS toon. Was very good for that, was pretty mediocre leveling, and endgame was fine but not really built for that as much.
Pally splits also look good esp for leveling; KotC Exalted Shot is the only AoE thrower attack pre-12 AFAIK, and T5 has another (probs 14/6 Pally/Monk?). Fisto Mk 1 posts some stuff about these if you search their history. KotC is a lot better with a favored weapon though, which means a lucky curse (lol good luck).
Personally with Monk 20 I think Ninja Spy is the way to go for now, unless you want specific utility. There's some flexibility, like HW is the best DPS but if you use Wis trance via HeM you free up some AP (for like Healing Hands).
This is about what I used (pre-Monk pass):
41 NS (capstone, T5 - Self Defense for leveling/questing, IAF for guild raids).
14 HW (Trance, Hunter's Focus - maintaining AF stacks outside combat and while moving a bit is huge)
11 VKF (C3 gets Quick Draw, Deflect Arrows, and 5% DS - also haste while leveling, but drop it later)
8 HeM (Contemplation, Ki Gen is hard - if you have enough via GMoF drop this for 8 AP probs in Shintao)
16ish Halfling depending on racials (Cores, Dragonmark, SA dice)
Shintao also has good points to grab, and is a great 1AP option.
Feat-wise grab the ranged feats, 10k, dragonmark, and I took 2ish combat style feats. Patience, Trick Shot, Overwhelming Crit, Watchful Eye, Eerie Aim. PSWF, Doubleshot, Embodiment, L Aim, Titan's Blood. Scion of Ethereal
ED choices pretty locked:
T5 Shiradi (Stay Loud, Inexorable, Whirling, Nerve Venom, Hunt's End, etc etc)
T3+ Fatesinger (Pluck of a String, Harmonic Resonance, Arrow of Discord, Master the Acoustics)
T3+ GMoF (Inner Focus, Enlightenment, Energy Absorbs)
Used to be Shadowdancer 3rd for the SA dice (and threat reduction), but with Shadow Double being a ki hog I think GMoF is quite a bit better. Might be worth running Epic Reflexes for no-fail, I didn't run enough with GMoF to get a good feel of this.
Stack AF (move every ~7s when out-of-combat waiting), then tumble for trick shot, then you can Pluck > animation cancel Arrow > Hunt's End and have your whole set boosted. IPS is great for questing, Pluck+Hunt pretty much kills a line of mobs.
Usually Water stance for ki gen (10k, Abundant, Shadow Double), but Air is best DPS leveling, and Fire endgame - but more often than not I ran whatever was needed for the double absorb via GMoF while raiding.
If you run Self Defense and max HP stuff when available (combat style feats, Titan's Blood, Yugo Con etc) you get pretty tanky without too much opportunity cost (I had 4k HP in Reaper), and with Water Stance ~40% Dodge + dodge hat you can tank most physical sources and kite most stuff. 200ish PRR, MRR is trash but you have amazing Evasion and very good elemental absorbs - but you need spell absorb swaps for everything else.