If you already have Assault or Maneuvers then Tactics is an obvious choice. If you lack either prerequisite then you should count Tactics as two power picks.
If the choice is Tactics + ? then I'd go for Disruption Arrow. If it's the choice between Assault + Tactics or Disruption + Stealth then consider how much endurance you can spend on toggles.
In any case, try out some different specs on the Training Room (if you don't know how, look in the apropriate forum) before you use your respec on Live.
Disruption arrow is AoE -res. Now, repeat after me:
You ALWAYS take AoE -res powers ASAP if you have access to them.
You ALWAYS take AoE -res powers ASAP if you have access to them.
You ALWAYS take AoE -res powers ASAP if you have access to them.
You ALWAYS take AoE -res powers ASAP if you have access to them.
You ALWAYS take AoE -res powers ASAP if you have access to them.
...
You ALWAYS take AoE -res powers ASAP if you have access to them.
Clear? 
[ QUOTE ]
You ALWAYS take AoE -res powers ASAP if you have access to them.
[/ QUOTE ]
It was negated to obtain another ability, but now i find that i dont use 2 of my attacks, ill make sure it makes its way back 
and Toxic, Trick Arrow is a very low endurance cost set. I dont have issues with endurance unless i unload my invisable quiver and let it rain 
So thanks, MaXimillion and toxic for confirming my thoughts of which to take 
(tatics and disruption)
@Inkwave ..(darn merge)
I am intending to respec Foresight out of two of his abilitys, Fistfull of Arrows and Explosive Arrow.
(i dont use those abilitys, so i may as well replace them with somthing usefull to myself and anyone i may team with)
I Wish To replace them with Either
Disruption Arrow or Tatics or Stealth. For the life of me i cannot decide on which to pick as all 3 of them would have there benifits.
So my question, Which 2 would be better to have at the moment? (at level 42)
@Inkwave ..(darn merge)