Theres also the AFV club kit. I think this is generally accepted as the best kit. Heres a comparison review on PMMs.
http://www.perthmilitarymodelling.com/reviews/vehicles/misc/sturmtiger/sturmtiger.htm
I bought the Tamiya kit years ago, still not built it yet. Its a very good kit and seeing as you havne't built armour for so long, you might want to start with that. The best AM for that would be the Aber PE set, but it could be very daunting if you haven't used PE before.
I am a Norfolk man and i glory in being so
On the bench: Airfix 1/72nd Harrier GR.3/Fujimi 1/72nd Ju 87D-3