Thank you Claudia.
Originally I was going to buy base tickets for four days (one day at each park), but now I've reduced the number of days for vacation to make it more affordable. I've reworked the schedule to include AK & DS on the same day, since I remember that we had seen much of what we wanted by early afternoon during our last trip. With the extended warm weather hours, I can add a break at BB in the afternoon of the day I have planned for Ep, and use 2nd option with a 3-day MYW Premium for DQ to break up the day planned for MK.
I'm only saving $10 each per a day on theme park tickets (over the cost of the 4-day base), but I've also added two more options (hopping and 2 plusses), not to mention saving money on the extra night's accomodations.