I think your Ranger is not bad... better than the PHB Ranger for certain. I have mixed feelings on the Special Technique feats. I prefer that combat feats for the Ranger should be picked up by the Ranger's bonus level feats (1st, 3rd, 6th, 9th, etc). They are not inappropriate, though, and do not overpower the class.
The only thing I do not like about your Ranger is the ability to cast invisibility. I would probably change to simulate hiding in natural surroundings... a bonus to hide/move silently, or maybe the ability to cast camoflauge... or the ability to hide in plain sight while in the Ranger's home terrain. A Ranger casting invisibility seems a bit too "arcane" and steps away from the nature-like template that most people try to convert the Ranger to.
Everything else looks good. =)
The only thing I do not like about your Ranger is the ability to cast invisibility. I would probably change to simulate hiding in natural surroundings... a bonus to hide/move silently, or maybe the ability to cast camoflauge... or the ability to hide in plain sight while in the Ranger's home terrain. A Ranger casting invisibility seems a bit too "arcane" and steps away from the nature-like template that most people try to convert the Ranger to.
Everything else looks good. =)