I think you should get the Chilton AND Haynes. I have them both and there's stuff in the Chilton book that's not in the Haynes and vice versa. For example my Chilton book has complete wiring and vacuum diagrams including fault code listings and troubleshooting for the ECU, the Haynes doesn't. But the Haynes has some simple tests (with an Ohm meter) for the distributor and other components that the Chilton book lacks. I'd like to find even more manuals if I could, you can never have too much information about your vehicle!
I've got both, and the FSM. of the chiltons and haynes, I like the haynes better. To me it seems like it just has more detail to it
The FSM is great, but it is a lot of $$$. I got lucky and bought mine off a friend who sold his truck.