We have a customer making 901hp(with 150hp injectors) on an 04 CA model . . . . .

Stick with the common rail. Expect twin turbos, twin pumps, some freeze plug playing, some big sticks, and some tuning. 800hp can be had without nitrous all day long. 2005 would be my weapon of choice. If you are serious, give me a ring and we can talk about it.