1) Perception boosting powers - tactics, clear mind, clarity, focused accuracy, focused senses etc etc.
2) Concealment pool is the only way to increase negative perception - stealth, invisibility and grant invisibility are useful tools if you want to rely on being "hidden"
3) Both work. Ninjitsu is probably better suited to the classic hit and run playstyle. Regen is better suited to dealing with tough targets that take more than one/two hits. Personally i prefer regen for stalkers. (ninjas suck, pirates rule!)
4) Fitness pool, mobility is king, perhaps concealment.
5) There are four zones for PVP - Bloody Bay caters to the 15-25 bracket, Sirens to 20-30, Warburg for 30-38, and Recluse's Victory to 40-50. If you are over the range, you get exemped to the maximum combat level, if under, you get boosted up to make the fights as "fair" as possible.
Hope that helps. (dark/regen should be pretty damn funky for PvP - touch of fear and the -acc from the standard attacks makes you a lot harder to hit, but with the full backup of the regen heals if they do)
I think I faced you in Sirens over the weekend Tanker.. you were great fun.. look forward to seeing your stalker 
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1. How come people can see through hide?
[/ QUOTE ] Hide is - percept, tactics targeting drone etc balance it out, hide+stealth are --percept targating drone and tactics stack for ++percept (same with focused acc which is a scrapper epic) and tactics, also clear mind and tactics) hide and grant invis or hide and invis takes you to the stealth cap which means peeps need +++percept (IE TD &tactics & CM for +++percept or stacked clear minds etc
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2. Is the only way to compensate for visibility, stealth?
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see above
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3. Would u say Regen or ninjitsu are better def for pvp?
[/ QUOTE ] Depends on style, but bear in mind no matter how high your def- is you ARE GOING to get hit
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4. what sort of extra pool powers does a stalker need or prefer to have?
[/ QUOTE ] fitness, depending on style/secondary flight,teleport or leaping. flights not the best chasing/escape power in pvp BUT well hello flying 1 shot bounties 
(IE flying defiance sniping blasters 
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5. (this isnt relted to stalkers) why is everyone exemped or whatever to lvl 30 in sirens? :S
[/ QUOTE ] that's the zone max for sirens call, if you are under lvl 30, you get boosted to the equiv- of 30 (ie gen damage output acc etc) if over you get auto exemped/malfactered down and also over lvl for the zone means the boost from your enhancements go off training enhancements (ie the normal starter type ofenhancements not SOs this is to try and bring balance to pvp to compensate for the fact you have more slots than a lvl 30 etc.
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I think I faced you in Sirens over the weekend Tanker.. you were great fun.. look forward to seeing your stalker
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most likely, i wasnt impressed by my performance at all.. haha, that was my tank build from about a year ago..
once i use my respec and outfit myself properly
i.e. replace slots and enhancments to adhere to the updates i missed.. lol
i shall become more of a match
and to everyone else, thanks alot for the help with my stalker questions
I'd say that fitness is almost a requirement for all archetypes (the 2 first powers support their travel powers and the 2 final powers are just good to have) you might want to delve into the teleport pool if you're going to pull hit and run tactics in PvP as it will quickly get you out of trouble and really makes you as good as impossible to follow. Also the healing pool is good since it gives you some instant health.
I hope this will help a fellow stalker.
Hmmm I am not sure teleport is the way to go with a stalker due nearly everyone is always moving about in the pvp zones to avoid the AS. That inturn makes it really hard to track players and unessary shots have to be used on your travel power to stop end useage
I personaly would recommend SJ or fly.
I also dont recommend getting all 4 of the fitness pool set due to that being a waste on other more important powers you will need for the pvp zones.
ok im relatively new to the world of villains and ive rolled a dark/regen stalker, but i have some questions, not necessarily on the build, but on the AT itself
1. How come people can see through hide?
2. Is the only way to compensate for visibility, stealth?
3. Would u say Regen or ninjitsu are better def for pvp?
4. what sort of extra pool powers does a stalker need or prefer to have?
5. (this isnt relted to stalkers) why is everyone exemped or whatever to lvl 30 in sirens? :S
thanks in advance