Here's the issue. Anytime you do a suspension lift, you have to address the shock & strut travel. You either have to lengthen them (in the case of longer springs), or re-locate the opporating range back to where the spring is now working (in the case of spacers - you're putting a spacer on top of the spring, and therefore need to put a spacer / extension on the top of your strut - in the rear you can just use crown vic shocks).
I hear ford 4wd coils will work with a little modification. Witfield played with them a bit....
The only longer strut is made by OME. So - if you go with a longer coil front - you HAVE to go with them. If you go with spacer, you can just flip your front strut mount (free) or get a strut spacer ($$$). OME also makes longer springs.... OME is the most expensive option, but it's easy to install, gives better suspension travel, and ride characteristics (bout $700). Spacers with new rear shocks / free strut flip can be done for $200-$300.