Cobra Company and Eduard sets compliment each other. They upgrade different items and are both great. I personally don't like PE and find most of it over engineered and hard to work with. If you have never done PE, I wouldn't recommend it. CC stuff is great though.
For the AH-1T+, it is the same kit as the AH-1W, just different decals. The AH-1W NTS is the latest version. This can be made from the AH-1T+ kit by getting the CC AH-1W NTS upgrade set.
http://www.cobracompany.com/35009.htm
New decals can be had from TwoBobs Aviatin Graphics, AH-1W Cobra Whiskey's in the Mix decal sheet.
http://www.twobobs.net/en-us/p_114.html
It features decals for 6 diferent aircraft.
Good luck.
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