I would go coils and radius arms. I have leaves and they ride either OK or reasonably well depending on which vehicle we're talking about. For the same expense and amount of development a coil sprung front will ride better than any leaf system. Radius arms aren't too difficult to build or you can buy them from sources like Cage Off Road or use some OE parts like those on Disco's, Early Bronco's, and later FJ's. Most guys get lost in trying to do 3 or 4 link systems and what they gain over a radius arm design isn't worth the considerable extra effort. The two leaf sprung LA trucks that I intend to keep will both eventually be radius arm and coil sprung.
The single thing that I would NOT do is use an OE coil. Use a coil-over coil, even if you don't use coil-over shocks. The range of available spring rates dwarfs anything available for even the most common OE application, and that will let you tune the ride to what you want rather than being limited by what you can find.
