Good questions.....
I myself have a NOVI (Paxton) a friend of mine (mufflerboy) just received his Kenne Bell 1500. We will be installing the NOVI in the spring and the Kenne this winter. I will have full install articles once we are completed.
Basically if you want HUGE amounts of Torque down low, get the Kenne, they really give you that "big block" feel.
I myself like the idea of the blower up top. If my friend and I were to race (with the same motors) I would beat him in the 1/4 because my blower would pull all through the race. He would also have big traction problems
I have a name and e-mail address of a guy selling a NOVI 1000 kit 1400miles for $1200. Let me know if interested. I can also get you one new for $1600.
Ian