I think you will find that with cheap duplications, you will compromise on staying power and the complexity of notes that define a perfume. i.e. your scent will most likely be extremely linear, no unfolding of the notes and just a straight mish-mash of all the notes that sit there doing nothing, smothered in alcohol.
I have Armani Code in the EDP, but find the Elixir is far superior and doesn't have the 'bug spray' feel like the EDP & EDT do. As they say, you get what you pay for.