Don't go with a 75mm with your parts listed or the throttle response will be crap. I myself use a 70mm and no response lag at all using the Cobra intake. I myself would skip both or those cams unless you need a emission passing cam. I would look into the Summit Twisted Wedge #1 cam. I have used many cams and this one has given me the best performance for the least money.
Twin Turbo Intercooled(TTi)