Haste boost, d6+3 SA. Agree that it is better to take at least slightly earlier in order to max out UMD.
You can get to monk12, monk12-18 currently doesn't really give all that much, PrCs might change that though. If that happens there's always TR.
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19-20:
2 base damage, 9ish DPS
shining star
AC
DR; good for fights intensive enough to wear through a stone skin clicky
shadow walk; neato
capstone; nice if you're going slow or have yet to learn to maximize ki usage
13-18
Higher tier windstance, 10ish dps
Higher tier strikes, 10ish dps iirc
Movement speed
AC
Ranger 6:
rams: 13 ish dps
FE: 26 ish dps
multishot
sprint boost
FE AC
Rogue 1:
hjeest boost: 15-20ish dps
SA: 30ish dps no fort, 15ish dps 50% fort
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Can splash ranger for sprint boost and +3 damage against...ebil outsiders?
Can splash cleric/FvS (early) to qualify for emp healing if halfer
Can splash bard for UMD, mini fascinate, empower healing
Can splash wiz if elf to qualify for AA and meta magic feat
Can splash fighter 1 for hjeest boost, toughness enhancement(10hp) and feat, fighter 2 for an additional feat and +1 str
Can splash pally2 for saves, loh and toughness enhancement