I would never recomend a modded/motor swapped car as a DD for a girl. If it breaks down your not gonna get any help from a dealership, they wont touch that thing. then finding a mechanic with dohc modular v8 skills? But, it is a nice car in general. I would buy one cause the interior is nice, there much lighter than 4th gens, and have tough rear axles and trannies. My order of pref would be a 3rd gen, then a 5sp/FI fox mustang, 4th gen lt1, new edge mustang, then an ls1 4th gen at the top.
Edit: of course i own the car at the bottom of my list