Don't know of any dinner packages for Illuminations.
We did the CP package a few years ago and are doing it again this year. This is a pretty good deal, at least at the a la carte restaurants (rather than the buffets). You get an appetizer or salad or soup; entree; and desert, and the tip is included. I've priced it out on several of the menus, and generally if you order an appetizer instead of salad or soup (because appetizers are generally more expensive), and stick with the more expensive entree items (not necessarily the MOST expensive), you will save a few bucks, AND get the CP seating.
We've got reservations for the new Fantasmic! dinner package for our trip in a few weeks. Seemed a bit pricey to me, and it says you order from a special menu (not from the regular menu as in the CP packages), but I'm paying the extra so as to not have to wait in line with a 2yo.