getting a new ride (newbie)

[Joules-2]

I'm driving an 85 na 300zx right now and I'm going to be getting a new car in a couple months. I'm thinking of getting the new cobra when it comes out. I want something that has a back seat in case I want to take 4 people along on short trips, but I also need something with serious speed that I can mod.
So, I like the fact that the cobra has so much horsepower, room for 4 if need be (its only the roush that has no back seat correct?) and I really want to go all out and get a vortech supercharger for it (so I can smoke trans ams, vettes and really smoke those annoying rice cars).
So, my question is does anyone have any opinions? Any other cars I should look at that you can fit 4 people in with performance rivaling that of the cobra? Is the backseat even big enough for an adult? Is the stang reliable? And finally, were can I read about mods to build the fastest damn cobra I can?
Sorry for so many questions.
thanks in advance!