Hi mate You see CA powered 1200s for sale quite often so it may be worth test driving a couple before spending any money.
After reading what you are after I think one of the better options for you would be to pick up Pigdog's L series. If you find this doesn't have the grunt you want you can always build an L23 Grunter out of it. I know of one that recently made 160rwhp. A well set up L23 will have great throttle response, impressive torque and sound incredible.