No love for Edd (Double D) from Ed, Edd 'n' Eddy?
Anyway, out of those choices, I have to go with Dexter. He has his own amazingly high tech lab stored within his otherwise ordinary suburban home in which he is capable of constructing seemingly everything under the sun, and he somehow manages to keep this a secret from his parents. Although, again, I would have to point out that Susan & Mary Test have done the same thing (except that their high tech lab isn't kept secret).