i'm in the same boat. i have decided when i buy an intake i'm getting a cobra one, for several reasons.
first, i've read many articles and threads that have said the typhoon, which is a edlebrock performer rpm knock off, can in some instances sacrifice low speed torque......although most articles say it works great abouve 2600 rpm or so.
so if you just have to put a manifold on now to try it, the cobra is better suited.
also, read the threads, magazine articles, etc, that cobra manifold is capable of making some serious power when it's ported, so you can definatly grow with it, and it shares the same lower as the gt-40 intake too.....
plus they are reasonably priced, a little more than the typhoon but, plus i think they look nice on a stang......just my 2 cents.....