Well after reading all this...i would say selling it is an option. But take it from me, real cars are built, not bought. You appreciate it a lot more when your own blood and sweat go into it. And on top of that, if you buy a cobra or a mach 1, your car is no different then all the other ones driving on the road. If i were you, i would go with a 5.4. You can go with the navi 4v and add a lil boost and a cobra or mach 1 won't even come close to touching it. And on top of that, you'll have more respect from people when you tell them you built it. The swap really isnt all that difficult to do. Just find you a 5.4, and either a t 45 or t 56 tranny, and most of the stuff is pretty easy. You might have to get a new hood and modify the wiring harness. But most of the stuff is pretty direct. And the torque of the 5.4 is amazing.