Check out these threads for more info.
Also you may want to look in to Superchips they have the Vivid (uses bluetooth) ( $600. + i think) which came out recently. They also have the Cortex and others.
The diablo predator is being phased out and being replace with Intune ( $300.+ i think) They also have the Trinity ($600. + i think)
I suggest going to their forums and reading up on what you want and need.