Couple of Stalker Questions

Having just finished my level 50 Widow, I wanted to try out a Stalker next as I did enjoy the melee type deadly attacks that my Widow gave me. So, I am starting with Energy Melee as my primary power set and for my secondary, went with Super Reflexes.

So my first question: As a Stalker you get "Hide" and based on the description it gives, it says "Unlike most stealth powers, Hide can be used at the same time as other Concealment powers, giving you even greater stealth capability." I was testing this out with just the "Hide" on and no one can see me and this was standing next to a 3+ higher level villain. Based on what I read in these forums, you might get seen if standing next to a AV or much higher level Boss but not sure about this?

So, with that being said, is there some kind of "scale" that will show you that if you combined your "Hide" with lets say "Stealth", it would give you maximum 95% invisibility and if you did "Hide" + "Superior Invisibility" would give you 100% invisibility to not be seen by anyone. Based on what I read, it seems this was nerfed awhile ago on previous issues to make it impossible to become completely invisible regardless of villain level?

And my second question: What would be the best Alt to compare a Stalker to? I've also read in these forums that a Scrapper is about the closest to this build. Thanks in advance to those that reply

Hide will make u invis to all the enemies in the game, with the exception of rikti drones and snipers i beleive.

Compare Stalkers in PvE to Scrappers, except with less survivability.

correct me if im wrong but what i understood from his post id that hide alone is enough for pve but hide +stealth +stealth IO = pvp stealth

That is exactly right. I will not confuse you with further numbers, especially since I play with metric distances, so I will put it this way:
Stealth powers work directly against perception range. The better a stealth power the more it reduces an enemy's perception range when it comes to seeing you.
- The power Stealth, VEATs' Mask Presence and some powers who give +stealth as secondary effect are enough to run in circles around normal PvE enemies as long as you stay out of melee range. Snipers, however, will kill you all kinds of dead before you get that close.
- Invisibility from the stealth pool, Superior Invisibility and anything else that might grant a non-stalker "total" invisibility allows you to cuddle for hours with mobs of your choice. Snipers will still kill you dead from quite a distance, though.
- Stalkers' Hide conceals you even better than that. It is actually better than a scrapper or controller could ever be hidden no matter how hard they try. You can cuddle with snipers. Anything that ignores +stealth completely will still see you, though. You will hate Rikti Drones. I know I do.
- Other than that, only in PvP there is a chance for you to be spotted with Hide if another player has boosted his perception high enough. Add Stealth and those people will not see you... unless they boost their perception to an unhealthy amount. (Warning! Do not look into the sun! Permanent eye damage!) Add a +stealth IO and even people who have eaten all the yellow inspis in the zone, run Tactics, Heightened Senses and FA and have bribed a truckload of defenders to buff them permanently will only see you if you get into melee range. Others will just pretend you are not there, because they do not know any better. Plus, other than with running Invisibility you are still allowed to attack anything that moves or, preferably, does not.

Clarification: Stalkers are less survivable due to the lower HP, damage mod and lower resistance cap. However, due to placate, when soloing it is very possible to consider the two even in those terms, however in groups, the survivability difference is noticable.