I've done the CP package in both 2002 & 2003 and enjoyed it. I dined both times at the Rose & Crown. I did the 2nd show in 2002 with dinner after, which worked out better than last year. In 2003, I did the early show, then dinner afterwards. 7pm was the only time available. I was told by the cast member that sitting further from the stage would be better and ended up getting soaked when it rained. The other downside to this time was that it was still pretty light outside, so you missed the background effects. By the time I had dinner, I was cold and wet and tired.
I would recommend getting a package at the R&C, but attend the 6 o'clock show and have dinner afterwards. When you check in at the podium, request a patio table. This way you can enjoy you dinner, then relax and view Illuminations during dessert.